This Blastoise, nicknamed Blasty, is a water-type Pokémon owned by Green.
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Green stole this Pokémon at the lab when it was a Squirtle. When it evolved into Blastoise, it was Green's most powerful Pokémon. Green uses this Pokémon to surf across waters.
When Blasty appeared in the Omega Ruby & Alpha Sapphire arc, it is seen that it is able to use Mega Evolution, Mega Evolving into Mega Blastoise.
An old artwork of Green's Blastoise from Pokémon Adventures volume 3