Zweilous

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Jiheddo is the evolution of Monozu, and the pre-evolution of Sazandora. It now has two heads, and is based off the Greek mythology creature, the Hydra. It evolves into Sazandora at level 64.

Pokemon Black
"Once it eats all the prey in its territory, it moves on to a different area. The two heads don’t get along."

Pokemon White
''"Since the two heads fight so viciously over food, it always eats more than it has to." ''

Trivia

 * Jiheddo evolves at the highest level of any pokemon (level 64).