From Bulbapedia, the community-driven Pokémon encyclopedia.
The Seagallop (Japanese: シーギャロップごう Seagallop) ferries are a series of boats in Pokémon FireRed and LeafGreen which transport the player from Vermilion City to or between the Sevii Islands and back. In addition, they are the only means of accessing Navel Rock and Birth Island in FireRed and LeafGreen (in Pokémon Emerald, where these two locations in the Sevii Islands are also present, the S.S. Tidal is the means used instead for transporting the player to and from the islands).
There are seven different Seagallop ferries, all of which are referred to as Seagallop Hi-Speed (Japanese: シーギャロップハイスピード), followed by a number. Before boarding a Seagallop ferry, a sailor will announce the model of the ferry, which varies according to the ferry's destination and port of origin.
The following is a listing of the various models:
Access to the Sevii Islands
After defeating Blaine and obtaining the Volcano Badge at Cinnabar Gym, the player will receive a Tri-Pass from Bill, allowing him/her to travel to and from One Island, Two Island, and Three Island.
After defeating the Pokémon League, if the player visits Celio at the Pokémon Network Center in One Island on One Island, he will ask for a Ruby and a Sapphire for his Network Machine. After the National Pokédex is received by the player and the Ruby returned to Celio, he takes the Tri-Pass and upgrades it to a Rainbow Pass, allowing access to all of the Sevii Islands so the player can find the Sapphire.
In the manga
The Seagallop in Pokémon Adventures
In the Pokémon Adventures manga
The Seagallop first appeared in Now You See Me..., where Red, Blue, and Green boarded the ferry at the Vermilion Harbor for One Island. During the entire chapter, the Seagallop was used by the main characters and Ultima as their main way of moving from Sevii Island to another.
Seagallop reappeared briefly in Epilogue as one of the ships transporting masses of people, including Ultima, Lorelei, Celio, Bill, Mr. Fuji, Baoba, and Green's parents, to visit the Battle Frontier.
In other languages