I can't get all my other colored pikmin across the valley of repose, they keep drowning! I wanted to get them to the Frontier cavern. ~~
First you'll need to get Blue Pikmin from the Awakening Wood; use Yellow Pikmin to knock down the electric gate that guards them. Once you've got Blues, go back to the Valley of Repose and use them to break the small rock formation in the lake to drain it and allow access for your other Pikmin. Go through the gate and you'll come upon a second lake which you can build a bridge across. I don't quite remember which side the bridge starts on, so you might need to use Blues to cross the lake in order to build it. Hope that helps. —Jimbo Jambo