Meet Volcanion, the Dual Fire and Water Type

Volcanion, the steam Pokémon, makes about as much sense as you would assume a fire/water type would. The 5'7, 429.9 lb creature uses fire and water to create steam that it jets from the arms on its back. 

Volcanion cannot be encountered through regular gameplay, but is appearing in a movie next year and will likely be released alongside it.