No need to get mad. People are trying to help you, but they need more information than what was given in the video.
I was also wondering if you had tried other games or if it was JUST Pokémon.
Have you cleaned our the slot in your DS that the games go into? Maybe a cue tip and a dab of cleaning solution?
Does anything look out of whack in the cartridge slot area? (like wires not connecting, metal poking out, and so forth?) A flashlight might help here.
Did you ever bend your DS 'too far' backwards, or farther back than it probably should've gone?
You could try unscrewing your DS to open it up and look inside. Sometimes when stuff like this messes up, it's because some wire or metal sheet isn't connecting correctly.
Did it happen after a drop? Or did it just happen randomly one day? (just curious)
Don't do anything drastic with the DS, but just opening it up via the screws on the bottom might let you know what's going on if a simple cleaning doesn't work.
But yeah, based off of the video it looks like it's some kind of connection problem with the inner-workings of the DS and it's connection to the top screen :/ A local game store might be able to help you out for a fee (or if they're nice/bored for free
) Just call around to get quotes from different stores.