Finally got enough Young Link's Belts to get Skull Kid's last three badges, and the last of the Assist Badges. Now the only materials I need for badges are seven Gohma's Lenses (three for Midna, four for Wizzro) and eight King Dodongo's Crystals (four for Ruto, four for Marin). That will finish up my Defense Badges, which are the only ones I have left.