So this is the overall Mandibuzz set up that seems to carry any utility at all
Mandibuzz @ Leftovers
Overcoat
+Sp Def or +Def, -Sp. Attack, -Attack if only using Foul Play, or -Speed if using U-Turn.
EV Spreads
252 HP, 252 Sp/Def, 4 Speed (Easy defender set up)
220 HP, 252 Sp/Def, 36 Speed (Leftovers number set up, and for speed creep, assumes lvl. 100)
220 HP, 252 Sp/Def, 36 Attack (Same as above, but for focus on slow U-Turns and helps for damage)
- Defog / Toxic
- Roost
- Foul Play / Knock Off / U-Turn
- Taunt / Whirlwind / Toxic / U-Turn
The EV spreads are all more or less the same, with a focus on HP and your choice of defensive stat (based on party comp). Overcoat, Roost, and Leftovers are the standard to put staying power on this guy, allowing him to ignore damaging weather and spore, and to have staying power otherwise. What makes Mandibuzz the most useful is it's sheer versitility that allows it to fill a myriad of defsive roles in a party, making him a threat and difficult to counter early fight. This, as well as the changes made in Gen 6, will make Mandibuzz a staple of the current OU. The above move list assumes he is either a Defogger or Toxic Stall with a strong secondary role (Denoted Below):
Phazer
-Whirlwind
-Knock Off
This set allows you to throw your opponents around and remove items and poison the lot of them. Good stop to buff set-ups, and can hinder other stall mon by removing lefties
Slow U-Turn
-U-Turn
-Knock Off / Defog
-Toxic / Defog
Similar to the phazing set up, it can jump in front of a hit, do something to hinder the opponent, and slow U-Turn away when you're ready. This is the best set (imo) that allows for Stall AND Defog. With no need for Sp. Attack, this is easier to breed a 0 speed nautre onto (31/31/31/x/31/0) to help the slower U-Turns.
Taunter
- Taunt
- Foul Play
Stop hazard and buff set ups and put the hurt onto any strong physical threat that gets switched in.
Now these are just common sets that allow him to fill roles while still having the option to Defog or Stall (Or both). My personal set up is the Taunter set up with Defog, as it fills in my team nicely (as I already have a phazer and a good Stall, and a mon that knows Knock Off).