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.
It's in the lost cave
Nowhere
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
Well, I don't really know the specifics, but you go to Mt. Pyre and go inside of the building that has all of those ghosts. And then you fall through the floor, and kabam, I guess you just find it there... Sorry, I don;t have a very good answer... I know it's not much to work with, but I hope you get it.