The PokeCenter is actually located underground. There's an old shed near the gym; if you go inside, there's nothing but a handrail and spiral staircase leading down about 30 feet. You end up in a small room with a door, and once you walk through, a huge waiting area and check in counter can be seen, all of the furniture modern and either black, white, or a gray tone. Everything is spotless and tidy. You hook and right down a short hallway and come to a large open cafeteria, and on the opposite side of the room is the PokeMart.