Alright, I guess I have to go into detail on this one.
In brawl, there was a very select methodology on how to desync pikmin, but it was entirely impractical.
In Project M, I made a code where if you buffer a smash attack from a whistle (not literally buffer, but you must go into a smash attack and no other actionID between whistle and the smash), ALL of your pikmin desync into that smash attack. Now this hear sounds immensely OP, because it is with 6 pikmin (6 pikmin desync downsmash can do over 100% damage lol), but the plan is to reduce him to 2-3 pikmin which will make use of desync incredibly tactical but not spammable.
Very cool uses include:
Pikmin latch -> upsmash or uthrow -> desync usmash on the latched pikmin for a vertical kill
However, you can realize that with 2-3 pikmin, pikmin chain will be completely unusable. Thats why we were going to make a new usmash for him. I am toying with the idea of giving his upB as a zair (not sure if that is even possible), but its way too early as I haven't put much work into him.