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
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
go to the battle tower. Across The Sea To The "Great Marsh".
If you surf across the sea, you'll reach an island where a pharmicist has the needed medicine
The Torch gets across the sea in a container
Across the Sea was created on 1996-09-24.
Across the Sea of Time was created in 1995.
Across the Sea of Suns was created in 1984.
New Zealand lies across the Tasman Sea from Australia.
Across the Open Sea was created in 1993-07.
pokemon blue sea