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Gary's Blastoise (Japanese: シゲルのカメックス Shigeru's Kamex) was the first Pokémon obtained by Gary on his journey as a Pokémon Trainer. His Japanese voice actor is Unshō Ishizuka and his English voice actor is Eric Stuart.
Blastoise first appeared in a flashback as a Squirtle in Challenge of the Samurai. But at that time it was not revealed to whom the Squirtle belonged to. It was finally revealed in The Ties That Bind, during Gary's battle with Ash in the Silver Conference, that his starter Pokémon was a Squirtle, which had now fully evolved into a Blastoise.
Blastoise is Gary's strongest Pokémon. It took out Ash's Heracross and Bayleef, and it nearly defeated his Muk. It also put up a good fight against his Charizard, but in the end, Ash defeated his rival.
Gary and Blastoise later appeared in Ill-Will Hunting! where they helped Ash, Brock and Dawn in protecting the Shieldon from the notorious Pokémon Hunter J and her evil minions.
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For more information on this Pokémon's species, see Squirtle, Wartortle, and Blastoise.