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 was one of Ash's most commonly used Pokémon throughout his travels in Kanto and the Orange Islands and proved to be a powerful fighter despite his small size. Squirtle was good friends with Ash's Bulbasaur and like Bulbasaur he has shown no interest in evolving despite the fact that he was certainly strong enough to have evolved. Squirtle kept the glasses he had while he was a member of the Squirtle Squad in his shell but rarely wore them.
Squirtle also battled against the Orange Islands Champion, Drake. It was squeezed by Bind, but used Hydro Pump to break free and finished it off with Skull Bash. In Enter the Dragonite, it fought Dragonite, only for its Hydro Pump to be countered by Dragonite's Water Gun. Squirtle was able to use Withdraw to endure most of the following Thunderbolt, but was still badly hurt. Squirtle used Bubble to hit Dragonite dead-on, but this was the only successful attack and it was beaten by a slam from Dragonite's tail.
Shortly after their adventures in the Orange Islands, Ash asked Squirtle to go back to the Squirtle Squad to help them stop fires.
Squirtle's latest appearance was when he joined Ash's team, along with Bulbasaur and Charizard in order to battle against Brandon. Squirtle defeated Brandon's Ninjask with Skull Bash, but is defeated by Solrock. After the battle, Squirtle returned to the Squirtle Squad and has not been used since.
Squirtle also appears in the Adventures in Unova theme song, and also appeared in a flashback in BW118.
|Water Gun +||Here Comes the Squirtle Squad|
|Skull Bash +||The Kangaskhan Kid|
|Tackle||The Misty Mermaid|
|Withdraw||Fire and Ice|
|BubbleBeam||Mewtwo Strikes Back|
|Hydro Pump +||Misty Meets Her Match|
|Bubble||Enter the Dragonite|
|Rapid Spin +||Gathering The Gang Of Four!|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.
- Ash initially wanted a Squirtle as his first Pokémon.
- Squirtle is Ash's first Pokémon to have a trademark item; his sunglasses, Sceptile during all of its evolutionary phases; the stick in its mouth, and the third, Krookodile coincidentally also wears sunglasses.
- Squirtle knew Bite In Island of The giant Pokémon, The only time using it.
- Even though Squirtle was seen at Professor Oak's lab in the opening titles of Pokémon BW Adventures in Unova, he wasn't present in the photo seen at the end of the Best Wishes! series of Ash and all of his Pokémon.