Boulder Puzzle in No Man's Land

There’s a boulder puzzle in No Man’s Land I’ve been trying for about an hour no, with no luck. I’ve no idea what to do. All I know is that some of the boulders roll, and there’s a Manaphy statue I assume I’m supposed to put somewhere. Other than that I’m bloody clueless. Anyone have any hints, pointers, or clues?

It isn’t really a puzzle. Just go from the bottom and grab an orb for a sinnoh legendary