Inkay was confirmed as a Poké Ball item in Super Smash Bros. for Nintendo 3DS and Wii U in the Greninja reveal trailer alongside many other Pokémon. Inkay uses the move Topsy-Turvy causing other fighters to trip.
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Inkay may look like a Water-type Pokémon, but it's actually a Dark/Psychic type! Once it has reached the proper level, Inkay can evolve into Malamar if you hold the Nintendo 3DS upside down. In Smash Bros., its Tospy-Turvy move will flip anyone who wanders too close upside down. Watch out!