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Zapdos (サンダー, Thunder) is a fictional creature from the Pokémon media franchise.
Zapdos is an Electric/Flying-type Legendary Pokémon introduced in Generation I, and is categorized within the Pokédex at #145 as the "Electric Pokémon". Along with Articuno and Moltres, Zapdos is part of a trio commonly referred as the legendary birds.
As a Poké Ball Pokémon
When Zapdos makes its rare appearance out of Poké Balls, it uses ThunderShock as its attack. Zapdos will discharge electricity and sparks will surround it. Any character besides the summoner that is caught in the discharge will not be able to move (but can SDI out of the electricity, as they can upon being caught in a Smart Bomb's blast radius in Brawl) and will take a lot of damage (up to 81% damage if caught by the attack at its start). The attack happens very quickly.
As a background character
In Super Smash Bros. for Nintendo 3DS, Zapdos makes occasional appearances as a background character in the Prism Tower stage. However, it is fairly rare. It flies in from the top of the screen, and quickly arcs back around and leaves the screen again.