Considering you didn't list a way in your post, must be pretty hard.
cause im not part of the pmbr and thats what they got signed up to do but this is at 12:00am so note
these are probably gonna be ideas that need ironing out or have major flaws because its 12 am and im about to go to sleep but
also note that i dont know how hard these are to put in the game im just listing ideas
-sort of like an ivysaur solarbeam system where if you hit people with pikmin moves you get a charge and when you pluck you get a pikmin depending on the amount of charges you have so like 1 charge = blue 2 charge = white 3 charge = purple (you would normally pluck red and yellow without any charges)
-the light on your head changes color depending on the type of pikmin your about to get and the pikmin alternate from yellow-red-blue-white-purple and then the light gets brighter and does the same cycle again and the light gets even brighter. the brighter the light depends on what stage its in so if its at the lowest brightness you get a leaf at the second stage of brightness you get a bud and at the highest stage you get a flower. this does support stalling and cheap defensive play but maybe it can also reward offensive play by increasing the speed of the time when you hit someone or the light only brightens when you hit someone? idk
the main things im incorporating here is the idea of improving over time and being rewarded by doing something right and not being rewarded for stalling for a silly amount of time. i want to be rewarded with a good pikmin by doing something not just shuffling pikmin (what would happen if there was a set order)
i want to also emphasize that being rewarded for good play should also increase the momentum you have so you should get pikmin that go with the situation youre in (purple is killing power, blue starts combos and kills at high percents, red is aerials, yellow is spacing and white is damage)