If I trade a hacked Pokémon onto Pokemon X and Y(if it gets through Pokebank), will it ruin or affect my game?

  • Well, if your hacked Pokémon has no weaknesses (Ghost-Darkness type) and the Wonderguard ability, then it'll most definitely affect the game in a big way. – Nolonar Dec 30 '13 at 16:35
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    @Nolonar Please note that Ghost/Dark no more has no weakness with the introduction of Fairy types. user6411, please edit your previous question instead. I suggested an edit but some people found that it was too drastic of a change when they don't appear to know the context of the edit... – Jerry Dec 30 '13 at 16:44

Something needs to be made clear, since it's apparent people don't really get how hacking works:

If a hack is made well, it is literally impossible to distinguish it from the real thing. If you looked at the code of a legitimate Pokémon, and then typed out that code line-by-line and inserted it into the game, that would be a hacked Pokémon, but it would be identical to the legitimate one in every way. Then it's just a case of altering some of the stats to be more to your preferences - as long as they also appear legitimate (AKA no moves it can't have at that level and under those conditions, and as long as trash bytes are handled properly, etc), then the Pokémon will be undetectable as a hack.

There is no such thing as a legitimacy checker - you can't check if a Pokémon is legitimate. You can only check if a Pokémon is legal, and a legal Pokémon can be hacked or it can be legitimate. You just have no way of knowing, because, contrary to popular belief, a hacked Pokémon does not contain any sort of "stamp" that declares it as a hack. The only way to tell if a Pokémon is hacked is to detect that it has data in it that it would not normally have been able to obtain.

So, to answer your question: if they put a decent legality checker into Pokémon Bank, then you will still be able to transfer a hacked Pokémon, as long as you hack it well. There are a lot of little pieces of irrelevant data in Pokémon which you may not be able to see by the naked eye, but which will give your Pokémon away as a hack if Pokémon Bank detects it. In many cases, you need to understand these in order to make a passable hack. If you don't feel confident doing this, find someone more knowledgeable who can do it for you, lest you make a mistake and suffer consequences such as losing the Pokémon or losing access to Pokémon Bank, both of which are possible.

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  • Thus, shinies with all 31 IVs are still possible in tournaments. – Snow Wolf Dec 14 '16 at 17:16

If you hack a legendary pokemon you can get it on Pokebank, but if it knows moves that it can't learn normally, it will be deleted.

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Not at all. There have been blatant cases of hacks passing through the Bank legit checks, and did no damage to the games.

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  • If anything, I'd expect the bank to work as sort of a safeguard / buffer, keeping the real bad news hacks out of circulation. – Raven Dreamer Jan 3 '14 at 3:45

Probably not. You just won't be able to use them in competitive battling. I've also heard that you can't even transfer over a hacked Pokemon through the Pokemon bank.

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  • While that may have been the initial claim, apparently the transfer app that some in Japan got a hold of before the whole delay debacle was allowing some hacks through (like shiny distribution only pokemon that were never released as shiney anywhere. I'm a little unsure if any more obvious hacks like Wonderguard Spiritombs made it through). – Trent Hawkins Jan 3 '14 at 3:44

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