The Pokemon Company has issued a statement concerning hacked pokemon. (Polygon has the translated summary.) The site warns players that using hacks to acquire “illegal” pokemon may damage saved files, and runs counter to the spirit of the game. Neither the Pokemon Company nor Nintendo will restore saved games or fix corrupted data. They also advise cheaters that if they are caught they will be banned from participating in any official tournaments.
You’ll never beat Team Rocket with those black market pocket monsters!