Golbat

Golbat has a lot of great qualities that make it a unique defensive threat in NU. First off, it has great bulk with Eviolite and awesome Speed for a defensive Pokemon, something few other defensive Pokemon in the tier can claim. Golbat also has a fantastic defensive typing, granting it a 4x resistance to both Fighting- and Bug-type attacks, as well as immunities to Ground-type attacks and the common Toxic. On top of that, Roost gives Golbat a form of reliable recovery to compensate for its lack of Leftovers. Unfortunately, Golbat's weaknesses to common Psychic- and Electric-type attacks are rather exploitable, and a weakness to Stealth Rock further hampers its ability to switch into attacks repeatedly. It also faces competition from Mandibuzz, as while their bulk may be comparable, Mandibuzz's immunity to Psychic-type attacks sometimes outshines Golbat's immunity to Toxic and resistance to Fighting-type attacks.