Iron Ball is an item in the “Bad held items” category (Items). It costs ₽4000.
In-game descriptions
| Diamond / Pearl · Platinum | A Pokémon hold item that cuts Speed. It makes Flying-type and levitating holders susceptible to Ground moves. |
|---|---|
| HeartGold / SoulSilver · Black / White · Black 2 / White 2 | A Pokémon held item that cuts Speed. It makes Flying-type and levitating holders susceptible to Ground moves. |
| X / Y · Sun / Moon · Ultra Sun / Ultra Moon | An item to be held by a Pokémon. It lowers Speed and allows Ground-type moves to hit Flying-type and levitating holders. |
| Let’s Go, Pikachu! / Let’s Go, Eevee! · Sword / Shield | An item to be held by a Pokémon. It lowers Speed and allows Ground-type moves to hit Flying types and holders that are levitating. |
Where to find it
Not placed on the atlas maps (so far: Red/Blue and Generation 3).
Sources : PokeAPI (items, item_flavor_text, machines) · atlas · pokeemerald species_info.h