Yanmega, Porygon Z and Cress all gets walled by Mandibuzz. Specs Yanmega and scarfed Porygon both fails to 2HKO it and you can easily toxic stall them. It has also no problem taking a + 2 ice beam from cress and can just knock off it's leftovers and toxic it. If it's behind a sub, just whirlwind it away. It's for sure one of the best walls in RU, especially with Blastoise leaving the tier when it updates. Hopefully it's gonna get some love again then. Beware of CB Druddigon, CB entei and Medicham though. Any sashed poke/pokemon with sturdy easily beats Yanmega as long as stealth rock is off the field.