When you get a Bad Egg or Hacked Pokémon poorly created, you can be sure that some functions will be disabled and in the worst cases, your Save is ruined. For example, once a Bad Egg replaced a Pokémon in your PC Box, it is useless to look for a way to get this Pokémon. It will be gone, erased by this multiplying egg (And sometime even from the Game code source !!!). Other sources claim the contrary : That the Bad Egg erase your Pokémon by replacing them !