If he's a villain... any idea who it might be? Who does Ant-Man typically go up against?
Pym and Lang have fought all kinds of villains. Mad Scientists, Communist spies, supervillains, aliens, robots, beings from other dimensions, sea tyrants, ect.
In terms of which villain Wilson could be my list would is
Erik Josten (also knon as Atlas, Goliath, Power Man & Smuggler) - A pym particle using supervillain who has faced off against both Scott Lang and Hank Pym. He was a Marine turned mercenary who was also often a member of the masters of evil.
Dr Nemesis (Michael Stockton) - An AIM Scientist interested in the subatomic world who stole Hank Pym's old Giant-Man gear. He is generally about stealing scientific secrets and gaining scientific knowledge for himself. Nemesis also used to work for Obadiah Stane.
Darren Agonistes Cross - villain from Scott Lang's debut Ant-Man appearance (To Steal An Ant-Man/The Price Of A Heart). Cross is a self made Billionaire and CEO of Cross Technological Enterprises a leading villainous technology company in the Marvel Universe rivalled by Stark Industries and Oscorp.
Darren is diagnosed with a rare heart condition. He used his own technology to create an experimental nucleorganic pacemaker to save his life. Although a success, the nucleorganic pacemaker mutated Darren's body to and gave him superhuman abilities. A side-effect of the mutation was that Darren would quickly overuse and burn out his heart. Multiple heart transplants were performed, but each heart was removed when overused. Desperate, he kidnapped heart surgeon Doctor Erica Sondheim to replace his damaged heart. He also kidnapped 'donors' from slums.
Crossfire - Cousin of Darren Agonistes Cross and a former CIA agent. Crossfire is a supervillain who is a master marksman and skilled brainwasher. In the Avengers cartoon Crossfire is portrayed as the villain in Scott Lang's origin as Ant-Man. Crossfire kidnaps Lang's daughter.