HE does many hammer attacks with his hammer and also trips to attack foes.
Special Attacks
Wii Remote + Nunchuk
Wii Remote (sideways)
Wii Classic Controller
GameCube Controller
Special Attack
Info
Inhale
Dedede is able to inhale opponents, similiar to Kirby, although he is unable to swallow them. Dedede is able to spit the opponents out very far as stars that do damage to other players hit by them. It's also possible to inhale items - but just like with Kirby, Wario, and Yoshi, avoid explosives or they will damage you!
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Waddle Dee Toss
The king throws Waddle Dees to the opponent. After thrown, they walk over the stage. Occasionally he throws Waddle Doos and even Gordos.
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Super Dedede Jump
He jumps really high and lands really hard. But be careful because you will be vulnerable. To cancel the jump tap down on the Control Stick, but with this you will be more vulnerable.
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Jet Hammer
King Dedede's hammer is mechanized, so you can charge it up and blow away opponents in one shot. This move cannot be saved, like Donkey Kong's charged up fist. If you charge it for too long, it will cause one percent of damage to King Dedede every second until you activate the attack.
Taunts
Wii Remote + Nunchuk
Wii Remote (sideways)
Wii Classic Controller
GameCube Controller
Taunt
He holds his hammer up and twirls it.
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He turns toward the camera and twirls his hammer sideways.
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He does a little spinning dance.
Final Smash
Waddle Dee Army: King Dedede summons a army of Waddle Dees, Waddle Doos, and the occasional Gordo, to attack players, doing around 8-10% Damage each. However, beware that they can be stopped by some attacks and items, like the Smart Bomb.
This attack, at it's fullest, is around 70% damage, however most people will get knocked around 50-60%. But, given King Dedede's Power, you can KO them after this with a smash attack.