MysticTicket is an item in the “Event items” category (Key Items).
In-game descriptions
| Emerald | A ticket required to board the ship to NAVEL ROCK. |
|---|---|
| FireRed / LeafGreen | A ticket required to board the ship to NAVEL ROCK. It glows with a mystic light. |
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