Key Items are unique items essential for story progression or accessing new areas. Examples include the Bicycle, Itemfinder, Silph Scope, Card Key, and various Gym Badges. Collectibles like Fossils (Dome and Helix) can be revived into Pokémon later. Nuggets and Big Pearls can be sold for high prices. Pay attention to NPCs, as they often give out valuable items or hints about where to find them. Don't forget the Vs. Seeker for re-battling trainers!
