From the Super Mario Wiki
The mission begins at the location of the previous mission. Mario must enter a doorway and subsequently capture a spark pylon. After reaching the next area, Mario must capture a Pokio and reach a Moon Shard under a cannon firing bombs. Mario must then go to a remote area with Spinies and collect the Moon Shard there as well, either by de-capturing the Pokio and high-jumping over a nearby torch, or poking the torch out while still in Pokio form. For the next Moon Shard, Mario must head to the other side of the cannon and move against the wall as the Pokio to reach it. The next Moon Shard is just beyond that area, trapped in a crate between two cannons firing bombs; Mario can simply knock a bomb into the crate to destroy it. For the fifth and final Moon Shard, Mario must get behind the area that had the third Moon Shard and go all the way to the end. Collecting all of the Moon Shards unveils this Power Moon.
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