Lugia really helps on the Klang stage because of its ability; took a few tries to beat it (just Mega Luke+Optimize) before I decided to use Lugia and S-ranked it with just a moves +5 after accidentally doing Klink with Lugia and moves +5 (still S-ranked that one). DD and moves +5 are enough to S-rank Sliggoo. Meditite can be S-ranked itemless, might take a few tries (best to use Gengar), and Skitty is easy to S-rank itemless. These stages are much harder than the last ten.
None of the new 'mons seem to be very good. Only Gothitelle seems to have a use, and that's only on Mega Mewtwo teams (although it's pretty good on Weekend Meowth, having Quirky+).