The problem with Smeargle is it can only lead. And it can lose to a wide variety of Pokemon. If your opponent has a grass type, it won't get off Spore. If they have a rapid spinner, they will just spin away your hazards that you lost a Pokemon for. If they have a Magic Bounce Pokemon Smeargle is completely useless. If they have a faster taunt user it completely shuts him down too. If they have something with a Lum Berry it can wreck Smeargle. RestTalkers will be a bit more common this generation too with the change in sleep mechanics. That's a lot of teams he is useless against.