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Only time 've seen anything like that was on an old CBNidoqueen set.
First of all, Rock Slide and Ancientpower on the same set is bad game. Second, Superpower on a defensive pokemon is bad game. It should look more like this:
Regirock @ Leftovers
Trait: Clear Body
Impish Nature (+Def, -SAtk)
- Curse
- Earthquake
- Rock Slide / Hidden Power [Rock]
- Rest / Explosion
or
Regirock @ Leftovers
Trait: Clear Body
Impish Nature (+Def, -SAtk)
- Counter
- Explosion
- Rock Slide
- Thunder Wave
The first set takes advantage of its defensive prowess, while furthering it even more so, while the second set is based on disabling/haxing the opponent, then resorting to last resort moves later in the game.