Anyone who experienced the last CommDay would know that Liepard is utterly annoying in Randbats (and probably elsewhere). Foul Play combined with Swagger, Thunder Wave, Substitute, and the ability Prankster is a recipe for frustration. The +1 priority Substitutes makes matters worse, so that whenever the Pokemon facing it avoids parafusion hax, they will only break a Sub. After enough uses of Swagger, Liepard can take a decent chunk of HP out anything with Foul Play. Liepard is difficult to beat in Randbats because there's no way to prepare against it. Rarely will you be given a Pokemon that can check it, so you will often have to rely on luck to beat it.