Hmmm... Where should I start ._.
Mewthree and that other thing doesn't exist...
Don't tell me to youtube it up, I've done that before and that video is an obviously (horribly) custom made one.
1) It is so damn choppy.
2) Anyone can access Pokemon sprites, which is how this was probably made.
Also, if it were to be real, it would require you to add a bunch of 0's and 1's onto the game to create.
Not to mention, it's not even on Serebii, where they even said all data was extracted from the game, and if those things were in the game, Serebii, along with a bunch of people, would have them.
Pretty sure something like this would require unofficial Nintendo Pokemon versions, which (I believe) is not supported (as in not discussed) here.