Hoopa is a-type Pokémon introduced in Generation VI. It is also known as the 'Mischief Pokémon'.
Hoopa's other form, Hoopa Unbound, is a-type Mythical Pokémon introduced in Generation VI. It is also known as the 'Mischief Pokémon'.
How to Obtain
Hoopa is obtainable during the Halloween Event, and is rarely encountered upon interacting with the Headless Horseman (located at a random grass patch on the map periodically).
Note: If he says 'Good Luck!' at the end, you have no chance of finding it at that point of time. There is a 5% chance for Hoopa to be found. If he says "By special Pokemon, I mean REALLY special", the next Pokemon you encounter will be Hoopa.
Hoopa has an Unbound-Form in-game, which you obtain by going to the Mausoleum of Origins, and interacting with the Pink Rock next to the PokeCenter.
Moves when caught
Moves taught by move-relearner