Solrock

Solrock is a staple in UU play for a good reason: it's immune to Earthquake, resists Normal and Flying, can hurt its opponents, set up dual screens, Baton Pass goodies, and use Explosion whenever it wants. It's been so influential that standards have changed: Gligar packs Toxic, Steel Wing or Iron Tail to deal with it, Fearow uses Steel Wing and some Ground-types use Hidden Power Bug or Ghost. Still, it's good to go. In standard, it can counter some Choice Banders like Salamence and Tauros pretty decently, but you'll have to predict even more accurately because despite its good HP and Defense, it takes quite a beating from neutral or super effective hits.