Ah yes, I forgot about that. Hopefully a Rock Wrecker tutor would do.There's actually a TR for Power Gem in the game, Coalossal just can't learn it for some reason. It really is just generally better off running Flare Blitz + Stone Edge + Earthquake if going for an attacking set to make up for it's poor Attack with good coverage and high Base Power...
Intimidate is a problem, but your Rock STAB having only 60BP is much more of a problem if trying to go for KOs.
With base 80 being so low for Attack and Sp A, is it even worth giving it any EVs for either of them? Then you can have a Coalossal that can utilize the best of both physical and special attacks.
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Btw, the Smogon page has a Flame Body Coalossal with Will-o-Wisp. Well here's the thing, once an opposing target is burned via Flame Body, then that makes your Will-o-Wisp move useless, a wasted 4-slot syndrome. Or, once a target is burned via Will-o-wisp, then that makes the Flame Body ability useless. (Is stuff like this common among Smogon entries or wha). Wouldn't a Steam Engine ability be better if it knows Will-o-wisp and to some extent, Scald?