You must receive the National pokedex before you gain access.
You will also only be able to access the boat during the evenings which vary depending on the season.
Spring: 17:00-19:59
Summer: 19:00-20:59
Fall: 17:00-19:59
Winter: 16:00-18:59
The Abandoned Ship is at Route 108, in the sea between Dewford Island and Slateport City. Enter it and keep using your Itemfinder to collect fallen items which include the keys to various doors of the ship. You will also find the only Luxury Ball of the Game here. This Poké Ball ensures that the Pokémon captured will be friendly. Remember not to use it on any Pokémon, as this is the only easy way to catch the Legendary Pokémon Regice. To fully explore the ship, you will need the Dive HM.
Get a ticket or pass.
By getting the hm surf.
Across the sea path by the lab. You have to have a GBA game though!
i don't think there is a Canalave city or do you mean Cainwood (across the sea)
if you mean in the sea of wailord you need to capture the mentine
If you surf across the sea, you'll reach an island where a pharmicist has the needed medicine
go to the battle tower. Across The Sea To The "Great Marsh".
The Torch gets across the sea in a container
Across the Sea of Time was created in 1995.
Across the Sea of Suns was created in 1984.
Across the Sea was created on 1996-09-24.
New Zealand lies across the Tasman Sea from Australia.
Across the Open Sea was created in 1993-07.
India is surrounded by the Indian Ocean on three sides. The neighboring countries across the sea from India are Sri Lanka to the south, Maldives to the southwest, Indonesia to the southeast, and Pakistan to the west.