Sea incense is inside the Lost Cave on Five Island. If you go right, up, down, then up you will find it.
-'Dawn KP' aka Bella
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This item is found in lost cave on five island.
You can't find the Old Sea Chart in FireRed.
you cant
Lax incense is found in lost cave on five island after going in the room with the hiker go right then down grab the item this is the lax incense.
Nowhere
It's in the lost cave
no it dose not disappear.
All you do is find the lax incense which is a hold item which makes the foes accuracy fall a little. EDIT: You can find 5 different items there.
Sea Incense can be found in the cave called Lost Cave on Five Island. Inside the cave go right, up, down, up and take the item.
Head to five island and use surf to head north then go east until you see a house from there continue east until you find a cave go in then when you see a hiker go right then down and you will find an item its lax incense.
abondon ship
you cant get another Sea Incense but you can get a Mystic Water it raises the power of water type moves