PokéBase - Pokémon Q&A
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I just need to know how In XY.

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Hoopa changes its form when the Prison Bottle key item is used on it.
It will revert when placed into a box. - This form is only in Omega
Ruby & Alpha Sapphire

Unbound Hoopa does not exist in XY. It can only be changed by ORAS

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how do you get the prison bottle key???