Aggron

Aggron is a terrifying presence on the battlefield thanks to its rare combination of Head Smash and Rock Head, meaning that it can use the move without any drawbacks outside of missing. As a result of this, and its rather large physical movepool, Aggron is one of the hardest Pokemon to switch into in the tier. Aggron is also one of the few Steel-types in the tier, and its high Defense makes it surprisingly resilient. Unfortunately, like other Pokemon of its types, Aggron has low Special Defense combined with major weaknesses to Water, Fighting, and Ground; this, combined with a rather low Speed stat makes Aggron vulnerable to a lot of threats, although many cannot switch into its powerful Head Smash.