Genesect

Genesect is a /-type Generation V Legendary Pokemon. Genesect was an ancient bug that was captured and experimented on by the evil Team Plasma. They turned it in to a soulless and heartless robot with pure metal armor skin and a big super cannon. The cannon move, Techno Buster, has chips called Cassettes that can change its type. There 4 types of Cassettes and their types are Fire, Water, Electric and Ice. The Cassettes are called Blaze Cassette, Aqua Cassette, Lightning Cassette and Ice Cassette.

Pokedex entry
A Bug Pokemon from ancient times, reconstructed from Team Plasma. They advanced the gun on it's back.

Trivia

 * Genesect is only obtainable in a future event.
 * If you take a Genesect to the P2 Lab and show it to the scientist there, he will battle you. If you win, he will give you 2 out of the 4 cassettes, with the two being different depending on which version of Generation V you have.