Purple Pikmin is used for mind games duh...
Fsmash, opponent notices the short distance and thinks of epic failure and "Omg this noob is going to get mad punished", then immediately grab on the rushing opponent, well I suppose you could do that with all the Pikmin...
You could always... convert C-Stick to "B"-sticking (set C-stick to specials)
SH backwards throw two pikmin Side+B, then right when you land Fsmash, then either attempt a grab or watch your opponent be blazed with fury. Common Olimar projectile play...
Oh and emphasizing giving Karma, would totally not deserve karma