Squirtle retreats inside its shell and speeds across the stage, powered by a jet of water shooting out the back of its shell. During this attack, Squirtle's shell behaves like a Green Shell for a limited amount of time. Squirtle cannot take damage from most attacks during Withdraw.
It is important, especially for beginners, to note that Withdraw is not a rolling attack like Yoshi's Egg Roll or Jigglypuff's Rollout; Squirtle is unable to change direction on its own or charge the attack beforehand. Spinning up and down hills can alter the speed in which the withdrawn Squirtle will move. The attack can be cancelled if the control stick is moved at the opposite side that Squirtle is attacking. The invincibility provided by the move is sufficient to block many Final Smashes that do not involve grabs. For example, Marth's Critical Hit can be negated, but not Ike's Great Aether.
Like some other moves, Withdraw's speed can be altered by smashing the control stick, instead of just tilting it. If another player lands on Squirtle while it is performing Withdraw on the ground, Squirtle enters a unique stunned state where it is flipped on its back momentarily. If Squirtle is footstooled while Withdrawing in the air, then the move will be canceled and Squirtle will be put into a helpless state of free fall and be unable to recover until it lands on the ground or grabs a ledge.
Withdraw is a Water-type non-damaging move introduced in Generation I from the Pokémon series. The move is only capable of being learned by Pokémon with shells. In battle, the move increases the user's defense by one stage. However, as Withdraw is not an offensive move, Withdraw's usage in Brawl may be based on Squirtle's use of Rapid Spin in the Pokémon anime. Squirtle learns Withdraw at level 28 in Generation I and at level 10 in Generation II and onwards.
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