If it's held by a Pokemon it will boost Water type moves.
That item doesn't exist in leafgreen their is a sea incense and lax incense in the cave.
Sea incense is found in lost cave.
in the lost cave on island five
put it on a Pokemon
you cant
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.
U look for it
the sea incense is found somewere in cerulean cave(which is in kanto)
there isn't a Pokemon game called "Blue Sea"
no you can receive it in the mountain next to lillycove Hope this helped =]
Breed Marrill/Azumarril with Sea Incense attached.
The Sea Incense is used for breeding purposes with breeding Marill or its evolved form of Azumarill so that it can create an Azurill Pokémon Egg. Additionally the Sea Incense can also be attached to any Pokémon and will have the added ability of boosting the offensive power of any Water-type Pokémon attack.