Okay, first it's called Strength. Second, go into Fusha City and go to the Safari Zone. Somewhere around there you'll find gold teeth(it's really fake though so don't sell it). Then go to the Warden's House and talk to him. He'll blab about how happy he is to have them back. He'll give you HM4 Strength. Have fun!
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any pokemon that can learn strength can push aside a big boulder
get hm strehngt
By using the move strength.
You lose the boulder. Go back to a different floor, then to that one and the boulder will be back in its original spot.
Well, you go back up, and there will be another boulder. Push that one down, then push it to Mespirit! Done!