This stage takes places within a volcano. There are seven sections and lava that will damage you.
Crystal Shard
The First Shard is in the third section, in the upper half of a pillar. Use Dedede's hammer to break it.
Crystal Shard 1
Crystal Shard
The second shard is in the fifth section in a block. Despite having fire and bomb colours, you will have to use an ice combo to get the shard (any ice combo will do other then ice + spark).
Crystal Shard 2
Crystal Shard
The third shard is in the seventh section where the lava rises, on the left side of the room.