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>Fisher's Wharf - Trade Rare Hoenn Fish for rare fish from other regions
>Feather and Oddities Shop - Sells Feathers (wings) and some drinks, nectars
>Rust-Burrow - A Deep hole dug by pokemon living underground, deep icy caverns await the not castrophobic trainer
>Charcoal Shop - Cutter's Cousin, got trapped in his shop by a Sudowoodo after cut wouldn't work on it. He'll give you some free charcoal for saving him, and sells some Fire type related items
>Seaside Villa - Beat the 5 fishermen and get your Fishing Rod
Fishing Rods have been redone, a basic rod is given early here, two speciality rods much later in the game.
>Todd's Berry's and Paints - New ingame trade for a Smeargle, will sell you berries that are good for colors (ie bluk berries)
>Rustboro Jewels - Once you beat Roxanne, you'll be able to buy gen V style jewels for high prices, or trade shards for them
>Mystic Cave - A small hidden grotto style cave, contains piece of a white map, there's several maps in the game you can find pieces for, the white map will let you visit Snowpoint City, you can't leave the city due to a Blizzard but this is how you get Regigigas