Blue Chu Jelly is harvested by defeating Blue ChuChus. It can be used to create Blue Potion in the Windfall Potion Shop.

Blue ChuChu Locations

The Blue ChuChu can only be seen in the following World Map locations: B-1, C-1, E-1, G-1, B-2, C-2, E-2, A-3, B-3, C-3, E-3, G-4, A-5, C-5, G-5, A-6, C-6, D-6, G-6, A-7, E-7, and F-7