Agiligross still isn't unheard of either, and in Celesteela's case you have beast boost for an attack boost on every KO which can give you a bigger effective return for your one turn investment on boosting speed. This is on a pokemon with considerable bulk, good defensive typing, good offensive coverage and with max investment is capable of 248 speed after one autotomize which puts it ahead of both max investment koko (200) or even max investment Pheromosa (223) for argument's sake, as well as any scarfers below around base 85-90 IIRC which will make it faster than scarf Xurk as well. Not to mention that even without autotomize, it does fairly well in trick room.
I don't get why you'd rather have the power either unless there's some super fat steel neutral/weak Alolamons I'm not aware of. You're still going to hit all of the important stuff at full power, the fattest Tapu weighs like 100lbs. It doesn't matter for Mudsdale at all because it's so fat that heavy slam is a bad move whether or not you lose weight, and Celsteela will probably carry grass coverage most of the time. This is also disregarding that it can easily run mixed or special sets with access to fire blast, grass knot, air slash, ect and also gets wide guard which is always a nice support option against rock sliders.