Team Snagem Hideout
Successfully complete the game and go to Pyrite Town. Go inside the secret passage by the bookshelf. Talk to one of the kids and fight Cail (the person with the green hair that hangs out near the entrance of Pyrite Town). After you win the battle, talk to Cail. The map will now show the Snagem Hideout.
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Team Snagem's hideout (the one you blew up in the beginning) has many trainers and some good items.