Squirtle

Squirtle is one of types of Pokémon species, introduced in the first generation of Pokémon games. In Pokémon Red, Blue, and Green, Squirtle was one of the three Starter Pokémon along with Bulbasaur and Charmander.

Main Pokémon games
Squirtle was one of the three starter Pokémon in all of the first generation Pokémon games excluding Pokémon Yellow, though in that game it could be acquired after coming in possession of the Thunder Badge. Squirtle wouldn't become a starter Pokémon again until the remakes of the first generation games, Pokémon FireRed and LeafGreen for the Game Boy Advance, though in every Pokémon game Squirtle could be obtained by trading, even in console games such as Pokémon XD: Gale of Darkness and Pokémon Colosseum for the Nintendo GameCube.

Super Smash Bros. series
In Super Smash Bros. Melee, Squirtle appeared as a float in the stage Poké Floats. A trophy of Squirtle was also in this game.

Squirtle appeared as a playable character in Super Smash Bros. Brawl for the Wii, where he was one of the Pokémon Trainer's three different Pokémon, the others being Ivysaur and Charizard. In the game he was the lightest of the three Pokémon, and was the only one who could perform water based attacks. A trophy of Squirtle could be acquired in this game.

Wartortle and Blastoise are both either mentioned or featured in the Super Smash Bros. series though have minor roles.

Trophy descriptions
Super Smash Bros. Melee
 * "Retreating into its shell and spitting water at its foes is Squirtle's trademark response to danger. It's one of the three Pokémon that trainers can receive from Professor Oak in Pokémon Red and Blue. Squirtle evolves into Wartortle and then Blastoise, ramping up its water powers with each evolution."

Super Smash Bros. Brawl
 * "A Tiny Turtle Pokémon. In times of danger, it pulls its arms and legs inside its shell to protect itself from enemy attacks. When it conceals its neck, it also shoots a powerful stream of water from its mouth. Its shell not only protects its body, it also reduces water friction when it's in the water. When it levels up, it evolves into Wartortle."