Hydreigon

Hydreigon is the final evolution form of Deino and the evolution of Zweilous. It is a Dark/Dragon type. It now has a head on each of its arms, creating a Hydra-like evolution stage. It also has three pairs of wings.

Trivia

 * Hydreigon evolves at a later level than any other Pokemon, Level 64.
 * Hydreigon's name came from "Hydra", a greek mythological dragon with many heads, "Drei", the german word for the number 3, and "Dragon"
 * Hydreigon cannot be found in the wild.
 * Hydreigon resembles Toho's King Ghidorah.
 * Hydreigon seems to resemble Salamence because both of their two pre-evolutions have weaknesses, until their pre-evolutions evolve into them
 * Hydreigon's pre-evolutions are blind, and unable to fly, until Zweilous evolves into Hydreigon.
 * Salamences's pre-evolutions are unable to fly, until Shelgon evolves into Salamence.
 * Hydreigon appears to be a parallel to Dragonite as it is a Dragon Pseudo-Legendary.
 * The frills around Hydreigon's heads were covering its eyes in its previous forms
 * Ghetsis's Hydreigon is under-leveled, being level 54
 * It could be possible that Ghetis' Hydriegon's evolution was induced by an item or by a machine
 * Hydreigon, along with its Generation V brethren, has a more realistic cry compared to Pokémon of previous generations
 * Hydreigon is one of the hardest to obtain due to the high level it evolves at, beating even Dragonite and Tyranitar
 * The Pokédex says that the heads on Hydreigon's arms lack brains, but it still uses them to eat and destroy things.