Serpent Garden

Underground Fields?!
The second dungeon is located in the Highland Field past the spores and Burgeoning Spiderworts growing near the Magenta Den which you should defeat before moving on to this dungeon. At the end of the spore patch there are some bridges to build across a little pond where some Yellow Wollywogs live. Just take them out and then search for a gap in the earth near here that you can sneak through (similar to a shortcut in Pikmin 1's Forest of Hope) which leads to a secluded little area which slopes downwards towards this dungeon. This is another 3 floor dungeon, but the first two floors are very large fields crawling with weak enemy insects. The final floor's boss is the serpent of the garden, and it'll be defeated more easily with Purple Pikmin, although reds can do the trick. You'll need purples if you want to carry back the spoils that this boss drops however- it'll unlock the next area, the Mountain Springs!

Portal- Kombat