>>23079567IDEA: All Pokémon have an extra item slot to hold one of these items. The items give a 50% boost, but each Pokémon has a limited list of which items it can use.
Eg: Charizard can use Charcoal, Sharp Beak and Dragon Fang.
Flygon can use Soft Sand, Dragon Fang, Sharp Beak and Silver Powder.
Stunfisk can use Soft Sand, Mystic Water, Magnet and Black Glasses (because it's sneaky.)
Fearow can use Silk Scarf, Sharp Beak, Black Glasses and Soft Sand (for drill moves.)
Goodra can use Dragon Fang, Mystic Water, and Poison Barb.
Gliscor gets Sharp Beak, Soft Sand, Poison Barb. and Black Glasses.
Castform gets Silk Scarf, Mystic Water, Charcoal, Nevermeltice, Magnet and Sharp Beak.
Basically, any Pokémon which learns a lot of moves of a certain type, or feels like it could have an extra type added on gets that type's item as an option.