Basically anything that can help the rest of your team do its jobStatus moves are what the Games mostly categorize them as, though Support Moves don't have to be Status Moves. They are usually moves that don't directly harm opposing Pokemon. Stealth Rock, Defog, Wish, Aromatherapy, Rapid Spin are examples of classic Support Moves. There are also others like Toxic, Thunder Wave, Will-o-wisp, Leech Seed, and Taunt, that are a bit more offensively-oriented for Support moves.