These are the towns in PokeLand. Each town has a gym lab and a store. If it doesn't that means that it is free to set up one. You can also set up one store to compete with another already set up. Mayors are the Gym Leaders. If there ain't any link then that means that the town has noone there or no gym.

Elite Town
Kryphos
Pewter City
North Town
Trios
Southwind
Nylan
Fairhaven
Westwind
Ghost City