Lileep

Lileep is a curious Pokemon in the Little Cup tier; in order to fully use its sweeping potential, you need to pair it with a certain Pokemon. The main component to any Lileep team is Hippopotas due to its ability to activate sandstorm, which raises Lileep's average Special Defense stat to one of the highest in the metagame. You also need a team that can soften up and remove problematic counters for Lileep so that it can safely stat up. Combine this with a decent HP stat, a strong Defense stat, a movepool that complements its natural bulk, and a helpful ability in Suction Cups, and you get a Pokemon that has the potential to sweep through unprepared teams.