Lol honestly, I thought it was because I've never seen a Muk being used ever, Even in NU so I thought it was pretty interesting, Overall it looks like you got weaknesses covered pretty well though.
Never really figured as a Muk being good but it is NU & 500 attack is pretty decent & with TR you made it a good combination to OHKO even some special attackers. Just be careful against gliscor a SD ,Taunt, Gliscor w/ Spec Def EVs.
9.5/10
The Muk is extremely creative.