Jet Ball is an item in the “Standard balls” category (Poké Balls).
In-game descriptions
| Legends: Arceus | Can be thrown further than a Wing Ball. Is more effective for catching Pokémon that fly high in the air. |
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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