Tears  Into  Roses

 

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Back when Pokemon X and Y came out. Some hackers found 3 Pokemon that you couldn't find in the game. Even to this day you still can't find them. Game Freak confirmed that one of the leaked Pokemon is real.

And that Pokemon is Diancie

The other two is for all we know gonna be Mystery Gift Pokemon or just plain event Pokemon.

Diancie is Fairy/Rock

The other two (Volcanion and Hoopa) 

That was Volcanion.

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And that is Hoopa.