Silvally is a Pokémon based on a chimera. It is, in fact, Type Null with its restraining helmet removed.

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Silvally is a quadrupedal Pokémon with the characteristics of several different Pokémon. Its body is mostly black. The lower half of each front leg is insectoid, green with spikes. Its rear legs have purple scales, and three-toed paws with a claw protruding from the back of the foot. It also has a fish-like tail, blue on the outside, gray on the inside, and lined on top with short spikes. It has a mane of white hair that hangs in strips to cover most of its chest and back, as well as long white hair from its head. It has a metal contraption attached to its snout and the sides of its head, perhaps a visor. On top of its head, Silvally's hair also takes the shape of a large spiked crest.

See:
http://bulbapedia.bulbagarden.net/wiki/Silvally_(Pok%C3%A9mon)
http://www.pokemon-sunmoon.com/en-us/pokemon/silvally/

See Also:

• Pokémon
• Type Null