Steelix

A combination of typing, bulk, and offensive presence makes Steelix arguably the best Stealth Rock setter in the tier. Its great typing lets it check prominent Normal-, Flying-, Psychic-, Steel-, and Fairy-types, such as Kangaskhan, Archeops, Musharna, Klinklang, and Mega Audino. This is backed up by Steelix's titanic physical bulk, letting it take on any physical attacker without a super effective STAB move. Powerful STAB moves also complement Steelix's decent Attack stat to give it a threatening offensive presence. However, Steelix's special bulk is mediocre, especially uninvested, so it can't quite take on Pokemon such as offensive Mega Audino and Choice Specs Swellow without taking significant damage. Common weaknesses to Fire-, Fighting-, Ground-, and Water-type moves don't do Steelix any favors, either, and allow Pokemon Steelix typically checks to eliminate it with a special coverage move, such as Fire Blast Mega Audino and Mawile. Lastly, Steelix's exceedingly low Speed stat is a hindrance, leaving it outsped by most defensive Pokemon.