Mandibuzz occupies a niche in the metagame thanks to its typing, defensive stats, and movepool. Mandibuzz's Dark / Flying typing makes it a decent check to Pokemon which rely upon Ghost-, Dark-, and Fighting-type moves for coverage. Recovery in the form of Roost, and an immunity to damage from weather conditions courtesy of Overcoat lets Mandibuzz stall more easily than other walls in adverse weather. However, Mandibuzz is unfortunately weak to Stealth Rock, making Rapid Spin support obligatory to prevent it from losing 25% of its HP on each switch in. Due to its poor offenses, Mandibuzz does not fare very well against most boosting sweepers, and is better suited to stalling with Toxic, along with damage from entry hazards and weather.
Due to its typing, Mandibuzz is better suited to being a special wall than a physical wall. It can switch into the attacks from threatening sweepers such as Gengar and Hydreigon, Roost off the damage, and stall them out. Toxic is Mandibuzz's main method of dealing damage. Due to its decent base 80 Speed and access to Taunt, Mandibuzz is also adept at wearing down opposing defensive Pokemon.
Brave Bird is Mandibuzz's most powerful attacking option. In particular, it deters Fighting-type Pokemon with Guts from switching in. Whirlwind is an option over Taunt which is best used in conjunction with entry hazards. In addition to racking up residual damage, it also prevents Pokemon like Jirachi from setting up on Mandibuzz in complete safety. U-turn deals minor damage to most Pokemon; however, it is good for gaining momentum, since a number of Pokemon can set up on Mandibuzz with relative ease. Rapid Spin support is a must if you elect to use U-turn.Team Options & Additional Comments >>>
Mandibuzz can run Nasty Plot, but it is too weak offensively to sweep. It is also outclassed as a Nasty Plot sweeper by Honchkrow, who has the same typing, but better offenses. Mandibuzz can also run a Mean Look + Toxic set, but such a tactic is situational, and will not work unless it can out-stall the opposing Pokemon. Competent opponents will generally know better than to keep a Pokemon in on Mandibuzz if it can barely damage it.
Checks and Counters
Steel-types such as Heatran can be problematic, as they wall Mandibuzz completly. While they don't resist Dark-type attacks, Metagross and Jirachi are bulky enough to take a Dark Pulse, and can dispose of Mandibuzz via Meteor Mash and Iron Head, respectively. Electric-type Pokemon such as the Rotom formes can beat down Mandibuzz with their STAB Electric-type attacks. Rock-types, including Tyranitar and Terrakion, operate in the same manner. Fast users of Taunt, especially those with recovery, such as Gliscor, can completely shut down Mandibuzz. Whimsicott can switch in as Mandibuzz uses Roost and lock it into using Roost with Encore. It can then use Substitute and Leech Seed to drain Mandibuzz of its health. It also has access to Taunt which prevents Mandibuzz from healing with Roost. Zapdos can cause problems for Mandibuzz, as it carries STAB Thunderbolt to hurt Mandibuzz.
Mandibuzz's Dream World ability is Weak Armor, which raises its Speed and lowers its Defense when it is hit by a physical attack. As a defensive Pokemon, Mandibuzz has little need for a Speed boost at the expense of a Defense drop, so this ability has little utility.