Steelix

Steelix is an anomaly in that it's a primarily defensive Ground-type. It has incredible Defense and resists Normal-type attacks, letting it counter Snorlax, and its Steel / Ground typing gives it a crucial Electric immunity paired with neutrality to Ice-type attacks, thereby making it a safe switch-in to Electrics with Hidden Power. It's also one of the best go-to defensive phazers for responding to threats such as Perish trap Misdreavus and Baton Pass Jolteon. However, while Steelix surpasses other Ground-types defensively, it falls incredibly short of their offensive prowess with an Attack stat of 268. Still, Steelix is not totally inept. With Spikes down, it can use Roar to shuffle the opponent's Pokemon with the best of them, and it can set up Curses to pressure the opponent or even sweep in a late-game situation where all the Pokemon capable of hurting Steelix are KOed. It also gets Explosion to instantly take out a wall. Overall, Steelix is an excellent defensive pivot and emergency phazer that, while offensively handicapped compared to other Ground-types, can still threaten foes.