From the Super Mario Wiki
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In Super Smash Bros. Brawl, when King Dedede uses his side special move, Waddle Dee Toss, there is about an 8.2% chance that he will throw a Gordo instead, which is even stronger than a Waddle Dee and Waddle Doo. A Gordo also appears as a trophy and a sticker.
In Super Smash Bros. for Nintendo 3DS / Wii U, King Dedede can only use Gordos in his side special, meaning the name of this move has been changed to Gordo Throw. Gordos also appear as an enemy in the mode exclusive to Super Smash Bros. for Nintendo 3DS, Smash Run. They are invulnerable to damage and damage players and enemies with their spikes if they run into them. They can be found either not moving at all or moving in a fixed direction.
While Gordos themselves do not appear in Super Mario Maker, if a Spike Trap is placed in a Super Mario World-themed underwater level, it will instead be a Sea Urchin from The Legend of Zelda: Link's Awakening, which in turn is based on a Gordo.
Super Smash Bros. Brawl
Super Smash Bros. for Nintendo 3DS