No Onions%: Save Louie without getting any onion (obviusly not counting the red onion).

No Pikmin Discovery%: (I don't even know if this is possible) Save Louie without discovering any pikmin (obviusly not counting red pikmin).

Edit: just discovered that in the No Pikmin Discovery% you can save olimar but not louie because of the two water wraiths that you have to kill in the final cavern.