Section 1: Beach Area ~ Entering Sand Castle
Section 2: Beach Area ~ Leaving Sand Castle. Bomb and Cutter abilities can be found in Section 2.
The first shard requires the Cutter and Bomb combo. In Section 3, there will be a mountain-like figure with an entrance on top, you must use the combo in there.
Section 3: Tide Pool. Rock ability can be found at the end of Section 3, right before Dedede.
Section 4: Tide Pool ~ Brought by Dedede. Cutter ability can be found in Section 4.
Section 5 has Kapar.
The second shard is a reward for defeating Kapar
The third shard requires Rock Cutter combo. The Shard will be on the left side in Section 6, keep switching forms until you are a hamster. While a hamster, hold 
and tap 
rhythmically to climb the wall up to the shard.
Section 6: Cave Area.