Pokémon FireRed and LeafGreen/One Island

'Welcome to Sevii Islands, where the next part of your journey takes place. You'll split your time among three islands, named One, Two, and Three Island. It's here that you'll have the opportunity to catch the famous Moltres. For now though, spend some time exploring.'

Arrival
When you first arrive, you'll be escorted by Bill to the local Pokémon Center, where you'll meet with Bill's friend, Celio, who's in charge of getting the local PC network up and running. The long storyline chatting in this part will contrast with the rest of the game.

You'll be given a Tri-Pass for a ferry between the islands, a second page to your map that shows some of the Sevii Islands, and a Meteorite to give to a friend of Celio's, who resides in another island, Two Island.

One Island
One Island is a small community, consisting of a Pokémon Net Center with a unique machine (one that lets you trade between Ruby, Sapphire, and Pokemon Coliseum, but you won't be able to use it for a while).

In addition, if you Surf left (from the dock), you will see Treasure Beach to the south, and if you head right and Surf north, you'll head towards Kindle Road. This is the way you must eventually follow to catch.

Feel free to explore Treasure Beach while you are here, but after you are done, it's best if you just head back to the ferry and set sail for Two Island.

Pokémon found

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Items

 * Meteorite (Given to you by Bill)
 * Tri-Pass (Given to you by Celio)
 * Town Map (Given to you by Celio if you don't have it yet)
 * Rainbow Pass (Given to you by Celio later on)

Treasure Beach


From One Island, head south by Surfing to reach Treasure Beach. Look for hidden items. It's just a spot where several items keep getting washed up, so you may return to it to collect more of them if you want.

Pokémon found

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Trainers

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Items

 * Ultra Ball (respawns) (On the beach)
 * Pearl (respawns) (On the beach)
 * Big Pearl (respawns) (On the beach)
 * Stardust (respawns) (On the beach)
 * Star Piece (respawns) (On the beach)