Key Items are unique, non-consumable items essential for story progression or unlocking new areas. Examples include the Acro Bike/Mach Bike for traversing specific terrains, the Devon Scope for revealing hidden Pokémon, or the Eon Flute for Soaring. You'll acquire most Key Items naturally as you progress through the main story. Hidden Machines (HMs) are special TMs that teach Pokémon moves usable both in battle and on the overworld to overcome obstacles (e.g., Cut, Surf, Fly). They are crucial for exploration. Technical Machines (TMs) are consumable items that teach a Pokémon a specific move. Unlike HMs, TMs are one-time use in Omega Ruby and Alpha Sapphire. They can be found throughout the region, purchased from shops, or received as Gym Leader rewards. Collect as many as you can to diversify your Pokémon's move sets.
