Inkay

Inkay is a dual-type Dark/Psychic Pokemon. It evolves into Malamar.

Physiology
Inkay is a Pokémon based on a Cuttlefish. It's body has a pink head with hypnotizing lights and it has blue skin.

Evolution
Inkay can be evolved into Malamar at level 30 while having a Pokémon Battle while holding the 3DS upside-down.

Trivia

 * Inkay's method of evolution is the most unusual of all evolution methods. Its method is the only evolution method that need the player to do something with the platform, rather than the program. This method of evolution would've been impossible to do in any of the other main series games, since only the 3DS has an internal gyroscope.