>>46872986RU is where you start to see Steel- and Ground-types that are bulky enough to take even a Rampardos Head Smash, and it starts having to play around with awkward coverage options in the remaining two move slots. UU is out of the question.
>Very few things are both fast and bulky>im-fucking-plying you need to be fast to strike before a Rampardos Head SmashRampardos has 58 base Speed. Fucking Tyranitar is faster. I'm pretty sure that most fully-evolved Pokemon without a Rock-weakness beyond that benchmark can take an Accelerock. I'll give you that it's hard to switch in to in almost any tier, but bringing it in isn't easy either given how slow and frail it is. Rampardos is a glass cannon, and a glorified Quick Attack isn't going to completely make up for that.