Pikatwo

Pikachutwo, is an Electric-type Pokémon originally cloned from Ash's Pikachu and is the secondary antagonist of the first movie. His name is never actually referred to in the anime (other than "Pikachu"), but it has been determined from the pattern of other clone Pokémon names (i.e. Mewtwo's name is a combination of Mew, the Pokémon it was originally cloned from, and the suffix "two". The same holds true for Bulbasaurtwo, Charmandertwo, and Squirtletwo). He is not to be confused with the Pikachutwo from The Birth of Mewtwo radio drama, who was among Mewtwo's friends that died.

History
Pikachutwo first appeared in the first Pokémon movie Mewtwo Strikes Back as a product of Mewtwo's cloning machine. He was cloned by a DNA sample retrieved from a Poké Ball containing Ash's Pikachu, and was released when the machine was destroyed by Ash Ketchum in his attempts to rescue his Pikachu. He then took part in a large battle, where the clone Pokémon brutally fought their originals for the sake of superiority. Pikachutwo attempted to join, savagely battling Ash's Pikachu to the point of exhaustion. However, Ash's Pikachu refused to fight back, despite Pikachu two's insistence and attempts to hurt him even when Pikachutwo could only stand when being supported. He was last seen at the end of the movie, flying away with Mewtwo.

Personality and characteristics
While other clone Pokémon are shown to be almost exactly the same as their originals where character and appearance is concerned, Pikachutwo is in many ways a lot different from his original. His appearance differs from Ash's Pikachu (and other Pikachu for that matter) by the black fur patterns on his ears, which are shaped in downward-facing spikes as opposed to a smooth curve. It must be noted that these patterns are almost identical to the patterns on a Pichu's ears, despite the fact that Pikachutwo debuted long before the introduction of Pichu in Generation II. Pikachutwo's voice is also distinctly different from Ash's Pikachu, and he tends to slur his words and kill people in comparison to his original.