Use the slow global crab and Skulteras to get up. The last part, just below the item is the hardest. Get onto the global crab on the right wall. Either freeze the Skultera close to the wall and wall jump between them. or, a harder option without wall jumps is to refreeze the crab again, higher on the wall, while being careful not to clip through it. Freeze the Skultera at the left, near its minimum and jump to it, then the solid ground. Note that the fish will be pushed down slightly over time because of the sloped tiles, but it will be at its minimum by the time the global crab has arrived.