Marine Cave (Map)
A Marine Cave (Map) is an item which will unlock the Marine Cave rumble area which can only be explored by a Water Type Pokemon.
How to obtain it
You can obtain a Marine Cave Map by opening Mystery Boxes
How to use it
If you have the Marine Cave Map in your item bag, you will need to give it to a Water Pokemon to hold..
By sending out a Water Pokemon to explore this rumble area, it will battle Kyogre. If your Pokemon wins the battle, it will return with a Sapphire. If it looses, it will return with the map, allowing you to re-send the Pokemon to the area.
Other
- Marine Cave Maps are trade able.