630 Mandibuzz

Snarl is preferred for its high energy generation, letting Mandibuzz access its charge moves sooner. Air Slash sports greater damage output and offers Flying-type coverage, but falls behind in energy gains.

Aerial Ace isn't particularly a strong move, but offers STAB Flying-type coverage. Foul Play costs the same amount of energy, however it deals more damage and is the better move in a neutral scenario. Dark Pulse costs 5 more energy, but also has 10 more base power. Shadow Ball lacks STAB with Mandibuzz.

Mandibuzz has been hyped ever since Gen 5 was announced for Pokemon Go, for various reasons. Its stat distribution features high bulk, while its moveset allows it to perform very similarly to Umbreon, another popular pick in the meta. Access to Flying typing and coverage gives Mandibuzz useful tools against common Grass and Fighting-types in the meta. As a Dark/Flying type, not taking Super Effective damage from Fighting-types while countering them with Flying-type attacks gives Mandibuzz an edge as a Dark-type. The loss of Sky Attack from the first Gen 5 datamine is unfortunate, but perhaps it's a reasonable nerf to keep Mandibuzz from breaking the meta. 

Level 50 has allowed Mandibuzz to see a lot more play in Ultra League. Much like in Great League, it's kinda just Flying Umbreon, with rapid fire Snarl+Foul Play spam and incredible bulk. The additional Flying-type provides it some advantages (only takes neutral from Counter), but also some obvious disadvantages (takes Super Effective damage from Ice/Rock). That said, it's absolutely worth considering for a spot on your team if you can afford it!

Mandibuzz lacks stats for Master League.