Secret Bases and the Underground

How do I set up an Underground base?

After earning the first badge in Kanto, Hoenn, Johto or Sinnoh, look for the Hiker in a house in that gym’s town. In Pewter, look for the house with the old man and boy who talk about battles. In Rustboro, look for the house with the woman and girl who talk about the Trainer’s School. In Johto, look in the northwest house in Violet. In Sinnoh, try the south house in Oreburgh. The Hiker gives you the Explorer Kit.

Use the kit from an eligible outdoor tile when the Underground is open to your character. In the tunnels, stand on the floor facing a flat wall at least three tiles wide and drill your entrance. Your first room is the Burrow. At your base PC, store goods and arrange them in the room. You can buy larger floor plans with Pokéyen as your flag rank rises.

What do the miners trade?

Take mined treasure to a treasure vendor to trade it for a sphere. A goods miner sells decorations for spheres and lists the colour and minimum size for each purchase. Stock varies by miner and player and rotates daily. Goods miners always stock a Solid Board, which bridges a hole in a floor plan. Trap miners sell traps.

How can I grow a bigger sphere?

Bury a sphere underfoot on an open tunnel tile. Red, blue and green spheres grow three size points per day. Pale and Prism spheres grow one point per day. Growth stops at size 99. Your own buried sphere appears on your map. Stand beside its sparkle and interact to dig it up. Other players can dig it up too, so remember where you planted it.

How does capture the flag work?

Visitors can take a flag from another Underground base’s PC. Bring it back to your own Underground PC to score. The owner can chase you and reclaim it when they get within one tile. Leaving the Underground or disconnecting returns unbanked flags to their owners. Bronze takes one capture, Silver three, Gold ten and Platinum fifty.

Does my Hoenn base replace my Underground base?

You can own one of each. In Hoenn, bring a Pokémon that knows Secret Power to an Emerald base spot, stand below it and face north. Use Secret Power and confirm to make that spot your home. Its location determines the room. You can start it before getting the Explorer Kit or earning a flag rank. Hoenn’s base PC is for your base and decorations. Flag captures are scored at your Underground base.