This Pokémon spent an unknown amount of episodes as Squirtle and an unknown amount of episodes as Wartortle. Ash's Blastoise was the fifth Pokémon that Ash caught in the Kanto region, and his sixth overall.

What happened to Ash's blastoise?

Squirtle was the sixth Pokémon Ash caught. He was originally the leader of the Squirtle Squad but took a liking to Ash and decided to travel with him. ... Squirtle defeated Brandon's Ninjask but was defeated by Solrock. After the battle, Squirtle returned to the Squirtle Squad and has not been seen since.

Did Ash Squirtle evolves into blastoise?

This Pokémon has not evolved. Squirtle was the fifth Pokémon Ash caught in the Kanto Region and his sixth overall.