I've got a pretty good mastery of Brawl's and feel pretty good with melee's :shrug:
Aside from 3 dash dances you can also quickly do two dashes and ice block/blizzard which is pretty quick. IMO 2 dash desync is the best goto since it's really fast and really practical.
The melee ICs should try doing consecutive shorthop/fullhop blizzards, it seems pretty powerful in PM. Shorthopping away from the opponent and using popo blizzard is a good escape tool as well as a good way to set up your wall. You can also b reverse Ice blocks and blizzards making your wall that much better.
They also gave Popo a CG to the ledge at really really low percents like Marth fthrow. So you can do that into hand offs. Only works on some characters and tbh idk if guaranteed (Falco) but try it out.
Here is just some random Brawl stuff I noticed
If you run and turn around, release the analog, the following input you do only Nana will do it.
If you do a pivot you retain the options you had from desync storing in Brawl. So if you pivot Nana will run and Popo will walk. If you grab, Nana will dash grab, do an attack Nana will dash attack. At mid percents, if you dsmash it will combo into dash attack allowing for follow ups. If you input a dash and then use an ice block, only Nana will ice block.
And some new developments.
If you shield and use cstick to upsmash, Nana will upsmash while Popo jumps.
Lastly idk how useful since PM is pretty fast but if you try to LD1 out of shield or basically hold shield and flick backwards as your shield drops and input an ice block, the climbers will just stand there and Nana will input an Ice Block.
Some interesting finds, I can't wait to see what else is discovered. Keep searching everyone!