Eon Ticket is an item in the “Event items” category (Key Items).
In-game descriptions
| Ruby / Sapphire · Emerald | The ticket for a ferry to a distant southern island. |
|---|---|
| FireRed / LeafGreen | The ticket required for sailing on a ferry to a distant southern island. It features a drawing of an island. |
| Sun / Moon · Ultra Sun / Ultra Moon · Let’s Go, Pikachu! / Let’s Go, Eevee! · Sword / Shield | The ticket required for sailing on a ferry to the Southern Island. Does Norman, the Petalburg Gym Leader, know a secret?! |
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