Aw zito, and i just caught you a nice Ditto in a Pokébal, jolly Nature, with 31 Attack and Speed IV's. and 25 in Def and 29 in SpD. solely to feed your OCD addiction.
You need to have the Ditto from a different LANGUAGE game. Doesn't work with two english games even if they are in different regions.
Hurray. Neutral nature and Intimidate. Breeding time. ^^ Taking bets if I get shiny before I manage to breed the IV's I want for my Growlithe.