In his debut appearance as a Squirtle, he was seen as very sensitive and is prone to crying which is why he decides to join with May in her travels. This behavior is a contrast to Ash's Squirtle who is immature, yet fun-loving. Squirtle has full potential on his abilities and can learn techniques without much training. In Gathering the Gang of Four, Squirtle easily befriends Ash's Squirtle when they play together upon meeting and he gives it a playful hug to think he has a sibling on his own.
Upon evolving as a Wartortle, she shows his bravery and confidence when competing in Contests.
Advanced Generation series
He debuted in The Right Place at the Right Mime as a Squirtle. Squirtle became attached to May while he was visiting Professor Oak's lab and decided to travel with him. He instantly took a liking to contests and learned Ice Beam without any training in order to defeat Team Rocket. Seeing Squirtle's potential in contests and in battle, May used her many times in Kanto, including her battle with Drew in the Kanto Grand Festival alongside Combusken against Drew's Flygon and Absol. After some tough battling, Squirtle dodges Absol's Flash and Flygon's Steel Wing with Rapid Spin, and strikes Flygon with Bubble. Squirtle knocks it out with Ice Beam, but the celebration is cut short when Absol harshly slams Squirtle into the arena wall with Iron Tail, which left Combusken and Absol to battle 1-on-1 for the second half of the battle.
In Gathering the Gang of Four!, Squirtle befriends Ash's Squirtle upon their reunion with Ash, Pikachu and Bulbasaur after being released by May. Both briefly play together as Ash's Squirtle does a playful hug, thinking it has a little sibling on its own.
Diamond and Pearl series
Voice actresses and actors
- Tomoe Hanba (Japanese as a Squirtle)
- Katsuyuki Konishi (Japanese as a Wartortle)
- Eric Stuart (English 4Kids dubbed as a Squirtle)
- Michele Knotz (English PUSA dubbed as a Squirtle)
- Craig Blair (English as a Wartortle)