Like the first code I entered, I gave you info on a location of a difficult to retrieve shard. I shall do the same now. On Aqua Star, in the second level, there is a boss, who is simply a giant crab. After beating him, there is a Crystal Shard above his platform. How do you get it? You see, look at the wall below the crystal. What is its pattern? Red and brown checkerboard. That means you must combine elements Burn(red) and Stone(Brown) to become a volcano! So, shoot the wall while being a volcano and press B! Here is a list of the elements' colors:

Burn= Red
Stone= Brown
Ice= Blue
Needle= Orange
Bomb= Black
Spark= Yellow
Cutter= Green