Spiritomb

One of the most prominent and useful Pokemon in the Underused metagame, Spiritomb should by no means be underestimated. He is arguably the best counter to Ghost-, Psychic-, and Fighting-type Pokemon in the metagame, and he is the only one who can successfully check all of them at the same time. Additionally, he is a fantastic spinblocker; while Mismagius and Rotom have an arguably better ability in Levitate, he more than makes up for this imperfection with his better overall defenses, wide array of immunities, and access to priority moves. Unfortunately, this collection of spirits has his fair share of faults. His lack of an instant recovery move and Levitate makes him somewhat easy to wear down, and though he has a plethora of immunities, he has no other resistances to switch in on. Furthermore, Spiritomb's offensive coverage is depressingly small; other than Dark- and Ghost-type attacks, which offer rather redundant coverage, he has very few attacking options. All in all, Spiritomb is undoubtedly one of the most useful defensive Pokemon in the metagame, as his ability to single-handedly counter most Ghost-, Psychic-, and Fighting-type Pokemon in the metagame is undeniably appreciated by many teams.