633 - 635 Deino Line

#633.5 - Deino are very wild Pokemon, who take a long time to mature. Their bad temper is in part due to their unstable genes, which continue to try to grow additional heads long into their evolution line. After a long time, one of the wounds on Deino’s torso will swell, and will eventually grow into a second head, with a second brain. The two heads do not get along.

#634.5 - As Zweilous get older, their body continues to undergo extreme physical transformation. Later on, the two heads will merge into one head, with a single brain composited from both individuals. During this process the Pokemon will lash out violently if it hears or senses anyone near it, and is incredibly dangerous. The Pokemon can not concentrate enough to fly until the process is over. After the merging process, this Pokemon more aggressive than before. 

Named:  Deino - Viertlion - Zweilous - Halbagon - Hydreigon

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Originally Posted: 02/28/15