I've been looking at the item files, hoping to make a user-friendly GUI for editing items, and need a second opinion on item_s_p.bin. For each item, there's two values. One identifies the rarity, the other identifies the Pokémon or Type. I have an idea about rarity 0xA. It's only used for the Eevee and Tyrogue line, but I think it's because the criteria for trading. Normally when trading for a 3 star item, you have to give the two 1 star items and the 2 star item for the same Pokémon. With rarity 0xA (also a 3 star item), you have to trade the two 1 star items and the 2 star item for the previous Pokémon (Eevee's lower items for Glaceon's item, etc.). I think it's safe to just say this is the case and update the wiki, but before I actually do so I'd like a second opinion, since I'm focusing more on development than research right now.