Adding your own pokemon.

[tjheartnote]

Is it possible to edit D/p/pl or hg/ss to include a 494th pokemon? I want to do this for a good friend. To include the pokemon Myuuta.

[Mewtwo Ex]

... Is that supposed to be a pokemon?! I googled it and found out...
3486
And i can tell you that you cannot add more Pokemon than the set amount.