It’s a new month and that means there’s a new legendary Pokémon! Owners of Pokémon X, Pokémon Y, Pokémon Alpha Sapphire, and Pokémon Omega Ruby are able to snag a Manaphy.
Manaphy is a water type that comes to you at level 100, has the Hydration Ability, and knows the moves Tail Glow, Water Sport, and Bubble. Manaphy will be available until June 24th.
On a side note, Manaphy can also breed, producing a Phione if it does whatever it is Pokémon do when they breed with a Ditto (thanks to Siliconera for that bit of info).