I beat it once by knocking out the reds with the first three teams with Kuga and Balsam on team 4.
on upper route, as long as both reds are dead, that worked.
EDIT
Started taking the lower route. With what I got, can clear it with out changing everything.
Meconopsis looks to be real good. No way to get her these days without Rainbow medals so doesn't much matter.
RG on Money tree (too bad she didn't get all the colors though) and Lamium looks good this batch.
but no RG gacha. Thats bad. Seem to be taking away everything