A Secret Base is a hideout from whence you can rest and resupply, Secret Bases first appeared in Pokémon Ruby and Sapphire. You can only have one secret base at a time. Your laptop or PC allows you to furnish it to make it more appealing. Generation III In Ruby, Sapphire and Emerald, secret bases can be created out of trees with vines hanging down, out of indents in certain walls and oval shaped bushes, but at first, you will not be able to make a base. After talking to a Trainer on Route 111 near a tree capable of being turned into a base, he will give the player Secret Power, enabling you to create secret bases. Generation IV In Diamond, Pearl and Platinum, secret bases can be created in the underground after receiving a Digger Drill from the Old man in Eterna City. Then you can trade spheres for more Digger Drills in the Sinnoh Underground.