I've only been playing a couple days so I'm not terribly good yet.
Love some pointers if anyone else is figuring him out. My big problem with him is getting
KO's. Seems like his down smash is the best KO move, but his up-smash is good too if you can land it. Sometimes Pikmin Chain ko's at high percentage, but I think you may have to "tipper" it.
The yellow, blue, and red pikmin all seem about equal for smashed and throwing. The purple ones are great for smashes, and good for throwing if you're also throwing some other pikming (they do knockback, which is nice in the middle of throwing other pikmin) The white ones are awesome for throwing, but icky for smashes.