Misdreavus

Misdreavus is ADV UU's most defining spinblocker and a key defensive pivot, functioning as the linchpin of many offensive and defensive Spikes stacking teams alike. Its coveted Ghost typing accompanied by Levitate give it a very valuable defensive niche by being immune to Spikes and checking physical attackers such as Gligar and Scyther, as well as Kangaskhan, Granbull, and Nidoqueen lacking Shadow Ball. Its good base Special Defense also lets it check Tentacruel and Blastoise to spinblock them more reliably than the other Ghost-types, Haunter and Sableye. Misdreavus also provides other methods of defensive support with tools like Thunder Wave, Pain Split, and Perish Song, which makes it a solid stopgap to most forms of offense.

However, Misdreavus's defensive capabilities are also met with having issues with passivity. Its main way of dealing damage comes from relying on Spikes, Toxic, and hitting super effectively, as its neutral damage is very pitiful. Misdreavus also struggles at taking hits from stronger opponents that hit it neutrally due to its low base HP, which harms its matchups against Pokemon like Arcanine and Solrock. It also means untimely critical hits are annoying as Misdreavus tries to wall Tentacruel and Blastoise. While Misdreavus can situationally check Kangaskhan by virtue of PP stalling, the matchup is flipped if Kangaskhan is running Shadow Ball, and the same applies to other Pokemon Misdreavus would like to consistently check such as Granbull and Nidoqueen, forcing it to scout their coverage.