1. Beat Dakim at Mt. Battle and Vander gives the first one to you.
2. Use the U-Disk to get up to Pyrite from The Under into the unknown room of the windmill and there's a box with the second one in.
3. Climb Mt. Battle in story mode and there's a box at the top of the stairs in Zone 100 with the third in.
People are posting in the forum. Yip!