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Squirtle is the lightweight of the three Pokémon at Pokémon Trainer's disposal. Its light weight allows Squirtle to have fast airspeed and fast attacks, which makes up for its somewhat slow dash speed. But the light weight also makes it easier to KO, as it is tied for the second lightest character against Mr. Game and Watch. Squirtle's excellent airspeed and quick attacks give it an excellent air game. Aerials have good priority and huge knockback, and inflict good amounts of damage. These aerials along with a high and quick jump give Squirtle a great air game. Squirtle is one of few fighters that can crawl and "Wall Cling". Squirtle's neutral special is Water Gun, which can be used to hamper horizontal recoveries and doubles as an attack. It can also DI during the charge in midair. Its side special, Withdraw, increases Squirtle's ground speed and offers protection against most attacks, other than grabs. However, speed and direction of Withdraw can be changed if hit with a strong attack, possibly causing Squirtle to slide off the edge, KOing itself if it goes off too far. Waterfall, Squirtle's Up Special Move, has a large, disjointed hitbox, making it hard to interrupt. It can also rack up damage throughout the attack and scores multiple hits. Like all of Pokémon Trainer's Pokémon, Squirtle can change places with the next monster at the Trainer's disposal (in Squirtle's case, Ivysaur). However, this can be punishable and is mandatory, due to the "Stamina Mechanic" (outside of the Adventure Mode) and coming back as the next one in the cycle. Most of Squirtle's attacks have low damage, with a few exceptions. Its up smash has a large area and can KO at 80-100%. Its down-aerial does multiple hits and has high horizontal knockback on the last hit. Its forward-Smash has "Super Armor" during the frames Squirtle is in its shell. Its down-throw has good knockback and can KO at high percentages. However, its side- and down-smashes have short range, little damage, and massive ending lag. Most attacks also have low range due to Squirtle's small stature. Squirtle's grab is also very short.
When introduced, Pokémon Trainer's only Pokémon is Squirtle, and thus, is his main Pokémon for much of the story until Ivysaur and Charizard are later found in the ruins. Despite this, Squirtle only appears in the very first cutscene Pokémon Trainer is introduced in.
Stamina doesn't apply in Adventure Mode as it does in normal play.
Keep in mind that all three of Pokémon Trainer's Pokémon share the same trophy base.
If you wish to power up Squirtle specifically, use a large [Water] damage boost and supplement the rest of its attacks with [Body], [Spin] and [Tail] attack boosts.
Squirtle, along with Olimar, is the smallest fighter in the game.
Surprisingly, Squirtle actually carries crates and barrels faster than Charizard or Ivysaur. This is probably because it uses the move Strength to carry heavy items since it is weaker than the other two.
When Squirtle knocks into another character using Withdraw, it makes the same sound as a Green Shell.
Along with Sonic, Sheik and Zero Suit Samus, Squirtle is one of the only characters to not be seen in trophy form during the Subspace Emissary. While Ivysaur and Charizard are both turned into trophies before their capture, and Pokémon Trainer is turned into a trophy by Tabuu's Off Waves, Squirtle is never actually turned into a trophy by means of ambush, a Dark Cannon, etc. Coincidentally, all four of these characters begin with the letter 'S'.
Curiously, Squirtle's visible outer body parts are larger, by volume, than his shell.
Squirtle is the only character who Pokémon Trainer uses who is not an evolved form. Charizard and Ivysaur are evolved forms of Charmeleon and Bulbasaur, respectively.