How do you change Hoopa's formes?

Question

I just need to know how In XY.

Answer 1

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

Comments

how do you get the prison bottle key???