Deoxys eh? This might be a bit tough Analysis, since Deoxys has more than 4 forms.... so I guess I'll just do them seperatly.
Regular Deoxys:
Pressure
Enemy attacks lose one extra PP. Increases wild encounter rate.
Type Tier
Psychic Uber
Statistics Min- Min Max Max+
HP
50
- 241 304 -
Atk
150
302 336 399 438
Def
50
122 136 199 218
SpA
150
302 336 399 438
SpD
50
122 136 199 218
Spe
150
302 336 399 438
Overview
Deoxys has been living under the shadows of Deoxys-A and is labeled as “outclassed” due to the fact that Deoxys-A has 30 more base points in the physical and special departments than Deoxys. However, Deoxys can still be an asset in the lead position with a little adjustment in the EVs. There are plenty of EV investments you can play around with to benefit from its defensive stats (even if they're rather miserable). It's important to note that outside of the lead position, it is completely useless, outside of the odd revenge kill with ExtremeSpeed (watch out for Stealth Rock chipping away at the remainder of its health though), so you're better off setting up Spikes as much as you can before it dies. Overall, Deoxys is not entirely outclassed by its other form; it is an asset on any team that requires a reliable lead.
Name Item Nature
Lead
Focus Sash Naive
Moveset EVs
~ Shadow Ball
~ ExtremeSpeed
~ Stealth Rock
~ Spikes
112 Def / 146 SpA / 252 Spe
Deoxys is a natural candidate for a suicide lead because of its fantastic Speed; it is only outpaced by its fellow form Deoxys-S. At first glance, this may seem outclassed by Deoxys-S, but surprisingly, this set is capable of handling other leads. Despite having miserable Defense, a couple of EVs invested into Defense can give Deoxys enough bulk to take hits from opposing leads. Shadow Ball is your main attacking option, which can deal with opposing Deoxys-S leads. With the EVs invested, it is capable of scoring a 2HKO with a Shadow Ball followed by ExtremeSpeed. If Deoxys-S uses Taunt, use Shadow Ball and follow it up with ExtremeSpeed to score an OHKO, preventing it from laying down any entry hazards. If Deoxys-S decides to go for the kill, Deoxys is capable of surviving 2 ExtremeSpeeds. Deoxys has a higher chance than Deoxys-S in defeating opposing Deoxys-S leads who invest 252 HP EVs. The last two slots provides entry hazards for the entire team, and works great on hyper offense teams that enjoy entry hazards being deployed early.
Team Options & Additional Comments >>>
Darkrai will always win this match-up, make sure to bring a Scizor of your own to combat Nasty Plot versions. Make sure something reliable takes Dark Void before sending in Scizor. Kyogre makes an excellent RestTalk user thanks to its high Special Defense stat. Ho-Oh could do this as well if Stealth Rock is not present on the field. You will never take down Groudon; your best bet is to deploy hazards and switch out to Kyogre who can nullify Drought and bring in Drizzle. Opposing Kyogre leads are also troublesome. In a similar fashion to Groudon, set up your entry hazards and bring in something appropriate. Most Kyogre leads are Choiced, so bring in Latias or Palkia to take Water Spout and hopefully scare it away with Grass Knot or Thunder, respectively. If Kyogre is running a support set in the lead slot, Blissey makes a reliable switch into it.
Team Options
Be sure to pack something to face possible threats in the lead slot. A possible encounter with Darkrai is going to trouble you without Taunt. As such, if you decide to stay in, utilize Stealth Rock or Spikes first before going to a deep slumber. Darkrai is tough to address due to its famous sleep move coupled with its ability Bad Dreams, and it can be really irritating. Activate Sleep Clause first and begin your plan from there on. If you opt to escape, switch in someone who can absorb Dark Void and switch out to Scizor who then can handle Darkrai. Due to Kyogre’s jaw-dropping Special Defense stat, it has a very good shot at taking Dark Pulse and is an excellent candidate to absorbing sleep. Ho-Oh can also do this as well, but Stealth Rock greatly restricts its switch-in opportunity; therefore, remove Stealth Rock first before bringing in Ho-Oh.
When immersed in sun radiation, you know you are up against Groudon. It is a good idea to drop Stealth Rock or Spikes before switching out. Kyogre can be a great switch-in, nullifying Drought and bringing in Drizzle. Kyogre can survive Earthquake from support Groudon and annihilate it swiftly with Surf. Beware of Toxic though; it can be a disturbance to Kyogre throughout the entire match. With the abundance of Deoxys-S leads, Kyogre is often forgotten. Similar to Groudon, lay down Stealth Rock or Spikes first before switching out. Kyogre often carries a Choice item in the lead slot; therefore, it can be great to scout out the first attack after you lay down your entry hazards. It will be much easier to articulate your thoughts after it has used its first attack. If it uses Thunder, Garchomp would probably be a wise switch-in, allowing you to set up on a switch-out. Overall, the safest switch in to Kyogre is Blissey because it can cripple with Toxic or Thunder Wave.
Optional Changes
Focus Sash + Calm Mind is very useful to get two potential Calm Minds — one on the switch, another on the attack — before you sweep. Ice Beam helps special Deoxys hit Dragon- and Flying-type Pokémon for super effective damage. For the Choice Band version, there's also Rock Slide for the Flying-types — especially Ho-Oh. Pursuit is an option for the Choice Bander. If you can get in on the Latias or Latios (after death or support move not called Thunder Wave/Substitute), you can KO them with this if they run off predicting Ice Punch. Deoxys can try using Trick on the Choice sets; however, you are usually just better off using that turn to attack.
A set that runs Focus Sash in conjunction with Counter or Mirror Coat is available. It can nab a couple of surprise KOs, however, the abundance of Stealth Rock and Spikes in the Uber tier means that this set will be really difficult to execute. This is better for starting matches, so entry hazards don’t hinder you, but you’re better off using the Lead set provided.
One remarkable option is a “SubPetaya” set, which uses Substitute and Petaya Berry, and allows you to take advantage by blocking status and priority moves. Unfortunately, this kind of tactic is better off being used by Deoxys-A, who is more effective at offense than Deoxys.
Counters
Deoxys must be beaten by prediction and combinations of Pokémon to switch in and resist its attacks. Some Pokémon deserve special mention: Latias wags her finger at Grass Knot, Superpower and Thunder, OHKOes it with Dragon Pulse, and Recovers off the residual damage. If Latias sacrifices Speed EVs in favor of HP and more Special Defense, it can easily survive two Shadow Balls from Deoxys. Forretress takes Superpower, Shadow Ball and Grass Knot like a real man, but it always gets 2HKOed by Thunder or Thunderbolt. Rayquaza resists Superpower and Grass Knot, but is 2HKOed by Shadow Ball, Thunder (which is 70% accurate against Rayquaza, though) or Thunderbolt. Rayquaza also has to watch out for Ice Beam, Ice Punch and Rock Slide. However, by Rayquaza's very presence, Deoxys trembles; Rayquaza is extremely capable of OHKOing with ExtremeSpeed. Ho-Oh's Defense makes Deoxys' Superpower underpowered against the great phoenix, and its great Special Defense can make Deoxys not so special if Deoxys doesn't have an Electric-type move. Spiritomb is immune to Superpower and Psycho Boost, and takes little from Grass Knot. It can then Pursuit or Sucker Punch the Deoxys away.
Dugtrio, while its chances of safely switching in successfully are abysmal, traps Deoxys and OHKOes Deoxys with Sucker Punch, provided the Deoxys attacks; however, you must be warned that ExtremeSpeed has the same priority as Sucker Punch, so Deoxys will move first with its higher Speed stat. Metagross Pursuits Deoxys to death if Deoxys doesn't 2HKO it first. Switching in Metagross is less dangerous than switching in Dugtrio, though, thanks to resisting Grass Knot and Psycho Boost. The Choice Band version is walled by a combination of Lugia and Forretress, who together resist all of its attacks and are never OHKOed single-handedly by one. Cresselia also works in conjunction, neutral or resistant to everything. A Pursuit Deoxys-S is faster than Deoxys and will survive anything this machine throws at it except for boosted Thunder and Shadow Ball, and forces Deoxys to die unless it has Focus Sash.
Defense Form:
Might need help on this one....
Well that's basicaaly all the forms I know guys.... feel free to add more cause I really don't know much about Deoxys....
Credit goes to Smogon for Information.
Regular Deoxys:
Pressure
Enemy attacks lose one extra PP. Increases wild encounter rate.
Type Tier
Psychic Uber
Statistics Min- Min Max Max+
HP
50
- 241 304 -
Atk
150
302 336 399 438
Def
50
122 136 199 218
SpA
150
302 336 399 438
SpD
50
122 136 199 218
Spe
150
302 336 399 438
Overview
Deoxys has been living under the shadows of Deoxys-A and is labeled as “outclassed” due to the fact that Deoxys-A has 30 more base points in the physical and special departments than Deoxys. However, Deoxys can still be an asset in the lead position with a little adjustment in the EVs. There are plenty of EV investments you can play around with to benefit from its defensive stats (even if they're rather miserable). It's important to note that outside of the lead position, it is completely useless, outside of the odd revenge kill with ExtremeSpeed (watch out for Stealth Rock chipping away at the remainder of its health though), so you're better off setting up Spikes as much as you can before it dies. Overall, Deoxys is not entirely outclassed by its other form; it is an asset on any team that requires a reliable lead.
Name Item Nature
Lead
Focus Sash Naive
Moveset EVs
~ Shadow Ball
~ ExtremeSpeed
~ Stealth Rock
~ Spikes
112 Def / 146 SpA / 252 Spe
Deoxys is a natural candidate for a suicide lead because of its fantastic Speed; it is only outpaced by its fellow form Deoxys-S. At first glance, this may seem outclassed by Deoxys-S, but surprisingly, this set is capable of handling other leads. Despite having miserable Defense, a couple of EVs invested into Defense can give Deoxys enough bulk to take hits from opposing leads. Shadow Ball is your main attacking option, which can deal with opposing Deoxys-S leads. With the EVs invested, it is capable of scoring a 2HKO with a Shadow Ball followed by ExtremeSpeed. If Deoxys-S uses Taunt, use Shadow Ball and follow it up with ExtremeSpeed to score an OHKO, preventing it from laying down any entry hazards. If Deoxys-S decides to go for the kill, Deoxys is capable of surviving 2 ExtremeSpeeds. Deoxys has a higher chance than Deoxys-S in defeating opposing Deoxys-S leads who invest 252 HP EVs. The last two slots provides entry hazards for the entire team, and works great on hyper offense teams that enjoy entry hazards being deployed early.
Team Options & Additional Comments >>>
Darkrai will always win this match-up, make sure to bring a Scizor of your own to combat Nasty Plot versions. Make sure something reliable takes Dark Void before sending in Scizor. Kyogre makes an excellent RestTalk user thanks to its high Special Defense stat. Ho-Oh could do this as well if Stealth Rock is not present on the field. You will never take down Groudon; your best bet is to deploy hazards and switch out to Kyogre who can nullify Drought and bring in Drizzle. Opposing Kyogre leads are also troublesome. In a similar fashion to Groudon, set up your entry hazards and bring in something appropriate. Most Kyogre leads are Choiced, so bring in Latias or Palkia to take Water Spout and hopefully scare it away with Grass Knot or Thunder, respectively. If Kyogre is running a support set in the lead slot, Blissey makes a reliable switch into it.
Team Options
Be sure to pack something to face possible threats in the lead slot. A possible encounter with Darkrai is going to trouble you without Taunt. As such, if you decide to stay in, utilize Stealth Rock or Spikes first before going to a deep slumber. Darkrai is tough to address due to its famous sleep move coupled with its ability Bad Dreams, and it can be really irritating. Activate Sleep Clause first and begin your plan from there on. If you opt to escape, switch in someone who can absorb Dark Void and switch out to Scizor who then can handle Darkrai. Due to Kyogre’s jaw-dropping Special Defense stat, it has a very good shot at taking Dark Pulse and is an excellent candidate to absorbing sleep. Ho-Oh can also do this as well, but Stealth Rock greatly restricts its switch-in opportunity; therefore, remove Stealth Rock first before bringing in Ho-Oh.
When immersed in sun radiation, you know you are up against Groudon. It is a good idea to drop Stealth Rock or Spikes before switching out. Kyogre can be a great switch-in, nullifying Drought and bringing in Drizzle. Kyogre can survive Earthquake from support Groudon and annihilate it swiftly with Surf. Beware of Toxic though; it can be a disturbance to Kyogre throughout the entire match. With the abundance of Deoxys-S leads, Kyogre is often forgotten. Similar to Groudon, lay down Stealth Rock or Spikes first before switching out. Kyogre often carries a Choice item in the lead slot; therefore, it can be great to scout out the first attack after you lay down your entry hazards. It will be much easier to articulate your thoughts after it has used its first attack. If it uses Thunder, Garchomp would probably be a wise switch-in, allowing you to set up on a switch-out. Overall, the safest switch in to Kyogre is Blissey because it can cripple with Toxic or Thunder Wave.
Optional Changes
Focus Sash + Calm Mind is very useful to get two potential Calm Minds — one on the switch, another on the attack — before you sweep. Ice Beam helps special Deoxys hit Dragon- and Flying-type Pokémon for super effective damage. For the Choice Band version, there's also Rock Slide for the Flying-types — especially Ho-Oh. Pursuit is an option for the Choice Bander. If you can get in on the Latias or Latios (after death or support move not called Thunder Wave/Substitute), you can KO them with this if they run off predicting Ice Punch. Deoxys can try using Trick on the Choice sets; however, you are usually just better off using that turn to attack.
A set that runs Focus Sash in conjunction with Counter or Mirror Coat is available. It can nab a couple of surprise KOs, however, the abundance of Stealth Rock and Spikes in the Uber tier means that this set will be really difficult to execute. This is better for starting matches, so entry hazards don’t hinder you, but you’re better off using the Lead set provided.
One remarkable option is a “SubPetaya” set, which uses Substitute and Petaya Berry, and allows you to take advantage by blocking status and priority moves. Unfortunately, this kind of tactic is better off being used by Deoxys-A, who is more effective at offense than Deoxys.
Counters
Deoxys must be beaten by prediction and combinations of Pokémon to switch in and resist its attacks. Some Pokémon deserve special mention: Latias wags her finger at Grass Knot, Superpower and Thunder, OHKOes it with Dragon Pulse, and Recovers off the residual damage. If Latias sacrifices Speed EVs in favor of HP and more Special Defense, it can easily survive two Shadow Balls from Deoxys. Forretress takes Superpower, Shadow Ball and Grass Knot like a real man, but it always gets 2HKOed by Thunder or Thunderbolt. Rayquaza resists Superpower and Grass Knot, but is 2HKOed by Shadow Ball, Thunder (which is 70% accurate against Rayquaza, though) or Thunderbolt. Rayquaza also has to watch out for Ice Beam, Ice Punch and Rock Slide. However, by Rayquaza's very presence, Deoxys trembles; Rayquaza is extremely capable of OHKOing with ExtremeSpeed. Ho-Oh's Defense makes Deoxys' Superpower underpowered against the great phoenix, and its great Special Defense can make Deoxys not so special if Deoxys doesn't have an Electric-type move. Spiritomb is immune to Superpower and Psycho Boost, and takes little from Grass Knot. It can then Pursuit or Sucker Punch the Deoxys away.
Dugtrio, while its chances of safely switching in successfully are abysmal, traps Deoxys and OHKOes Deoxys with Sucker Punch, provided the Deoxys attacks; however, you must be warned that ExtremeSpeed has the same priority as Sucker Punch, so Deoxys will move first with its higher Speed stat. Metagross Pursuits Deoxys to death if Deoxys doesn't 2HKO it first. Switching in Metagross is less dangerous than switching in Dugtrio, though, thanks to resisting Grass Knot and Psycho Boost. The Choice Band version is walled by a combination of Lugia and Forretress, who together resist all of its attacks and are never OHKOed single-handedly by one. Cresselia also works in conjunction, neutral or resistant to everything. A Pursuit Deoxys-S is faster than Deoxys and will survive anything this machine throws at it except for boosted Thunder and Shadow Ball, and forces Deoxys to die unless it has Focus Sash.
Defense Form:
Might need help on this one....
Well that's basicaaly all the forms I know guys.... feel free to add more cause I really don't know much about Deoxys....
Credit goes to Smogon for Information.