Rock Pikmin are incredibly useful in Pikmin 4, but you
Rock Pikmin are incredibly useful in Pikmin 4, but you'll need the Rock Onion to raise their numbers. Here's how to find it.
Where to find the Rock Onion in Pikmin 4
Onion, Pikmin Wiki
How to get the Ice Pikmin Onion Early in Pikmin 4
Rock Onion Location and How to Get
How to Get the ROCK ONION in Pikmin 4 (but Mostly Guide for Beating Sovereign Bulblax)
Pikmin 4: all Onion locations - Video Games on Sports Illustrated
Pikmin 4: all Onion locations - Video Games on Sports Illustrated
How to Get Rock Pikmin and Black Onion - Pikmin 4 Guide - IGN
How many areas are in Pikmin 4? - Dexerto