I never considered Scarfchomp the epitome of power, seeing as it failed to kill my Heracross in Ubers once, so that doesn't really surprise me. Mixmence, however, is still getting the 2HKO, so he's happy. Also, don't forget Meloetta has access to Thunderbolt with huge special attack to back it up, relegating Burungeru to a minor annoyance at best.
I always considerate a pokemon with 130 attack stat using 180 BP moves strong, but thats me.`Also mix mence isnt 2hko'ing any time soon after he gets burned:
mix mence outrage 58.2% - 68.6%
mix mence draco meteor 57.2% - 67.6%
-2 Draco Meteor 29.2% - 34.4%
-2 Outrage 31.4% - 37.4%
I know burunkeru cant switch in, but how many things can switch in versus mixmence? Not getting forced out by him is a big plus
The most common meloia set was something like
Meloia@ Leftovers/ Life orb
252 atk/ 252 spe/ 4 spc atk or 4 hp
Jolly/Naive
Ancient Song
Close Combat
Night Slash
Psychic/ return/ quick attack
You cant KO burunkeru in the switch with psychic or night slash ( max attack jolly LO NS 37.1% - 44.1%). If you use thunderbolt other pokemon like gliscor and hipowdon wall you (psychic kill them with entry hazards). But this isnt a burungeru disscusiion so...
IMO the best set (physical) is max attack/ max speed with ancient song/CC/ night slash and u-turn LO, leftovers or even expert bell (amazing coverage with 2 moves), in early/mid game spamming u-turn and see your counters, if you opononent switch in a ghost something like scarftar can put them in a hard position and if the oponent switch something like scarftar you can use ancient song the next time outspeed and ohko with CC