Deep Ice
From Starfy Wiki
Gooey Ice is an obstacle that you can only enounter in Chillydip Cove[1] in the Ninendo DS[2] game The Legendary Starfy[3]. It looks like a light blue semi-transparent wall. You can pass it two different ways:
1. You can transform into Starpedo[4] and use Icy Spike/Super Icy Spike to freeze & shatter it.
2. If you have a DSi Action Replay and you activate the cheat Moon Jump, you can swim right through it. If this cheat is not activated, you will not be able to swim through it.