By using the move strength.
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You lose the boulder. Go back to a different floor, then to that one and the boulder will be back in its original spot.
any pokemon that can learn strength can push aside a big boulder
Well, you go back up, and there will be another boulder. Push that one down, then push it to Mespirit! Done!
get hm strehngt
one of you Pokemon in your party need to learn strength.