The “Smash Bros.” pro scene really didn’t start to develop until the second game, “Super Smash Bros. Melee” for GameCube, was released. Many players cut their teeth on this version and some even continued to prefer it to the Wii “Smash Bros.” game released several years later. Even those that did switch to the Wii game tended to use GameCube controllers instead of Wiimotes because they offered more precision and the first few iterations of the Wii console had built-in GameCube controller ports, requiring no adapters at all. Because of this multigeneration precedent, much of the instruction in YouTube videos or strategies discussed online are based upon the assumption of players using GameCube controllers. That isn’t to say you can’t be a competitive “Smash Bros.” player using another controller type; there are successful players using Pro Controllers right now.