Because it allows you to dodge an attack while building up poison damage and using Black Sludge for recovery. The same reason some sets for other 'mons use Sky Drop, Fly, or rarely Dive. It's not unheard of, and this is hardly the worst set one can run for Muk. As for running Brick Break over Dig, that depends on how long something has been poisoned. Let's take a an example:
252+ Atk Muk Dig vs. 252 HP / 252+ Def Alomomola: 69-82 (12.92 - 15.35%) -- 9HKO at best
252+ Atk Muk Brick Break vs. 252 HP / 252+ Def Alomomola: 65-77 (12.17 - 14.41%) -- 9HKO at best
Similar damage - but! - using Dig gives you 18 turns of recovery, and if you're using Toxic, the Alomomola will die quite a bit before then, and your Muk will regenerate far more than its health maximum over again via black sludge, healing any damage taken. I don't see how this set is as silly as Lemonade Armaldo anyhow. I'll admit I haven't tried the strategy with Muk before, but the concept is one I've used on several other occasions. It's possible to try to stall with just Brick Break, but there's almost no reason either it or Dig offensively over a STAB move anyway on this set; Dig is about the free turn, not the power. Poison is only resisted by steel, ground, ghost, rock, and other poison types anyway. Ghosts are immune to brick break, steel and rock types are hit just as hard by Dig, and opposing poison types (who you can't poison to death!) are hit much harder by Dig. What advantage does Brick Break have over Dig on this set? Mean Look turns the extra turn into an advantage, rather than a crippling flaw.
Besides, I'm a more a fan of Raseri's set than Ice96's at the moment. (Not that Ice's set looks bad; I just really like Curse on 'mons with priority.)
252+ Atk Muk Dig vs. 252 HP / 252+ Def Alomomola: 69-82 (12.92 - 15.35%) -- 9HKO at best
252+ Atk Muk Brick Break vs. 252 HP / 252+ Def Alomomola: 65-77 (12.17 - 14.41%) -- 9HKO at best
Similar damage - but! - using Dig gives you 18 turns of recovery, and if you're using Toxic, the Alomomola will die quite a bit before then, and your Muk will regenerate far more than its health maximum over again via black sludge, healing any damage taken. I don't see how this set is as silly as Lemonade Armaldo anyhow. I'll admit I haven't tried the strategy with Muk before, but the concept is one I've used on several other occasions. It's possible to try to stall with just Brick Break, but there's almost no reason either it or Dig offensively over a STAB move anyway on this set; Dig is about the free turn, not the power. Poison is only resisted by steel, ground, ghost, rock, and other poison types anyway. Ghosts are immune to brick break, steel and rock types are hit just as hard by Dig, and opposing poison types (who you can't poison to death!) are hit much harder by Dig. What advantage does Brick Break have over Dig on this set? Mean Look turns the extra turn into an advantage, rather than a crippling flaw.
Besides, I'm a more a fan of Raseri's set than Ice96's at the moment. (Not that Ice's set looks bad; I just really like Curse on 'mons with priority.)
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