1) Score doesn't matter for ranks. Moves left do. Move +5 may not make catching Pokemon easy, but as for obtaining higher ranks...they do.
2) Use two weak Fighting-types and two other Pokemon you may want to train in the Meowth stage for better coin grinding. Do NOT use any Pokemon with an ability that destroys coin icons.
This. Try and match 4 coins, unless matching 5 will be REALLY easy, and don't be afraid to match 3 if you're worried you might kill Meowth.
Yes, I found Sigilyph surprisingly easy as well. As for the new mons, 7 S-ranks so far (Munchlax, Larvesta, Milotic, Smeargle, Pancham, Trubbish, and Chespin), and missing Froakie and Onix. Going to grind for coins to ensure my S-rank before attempting them gain so I can save time.
Has anybody got all 15 at S-rank so we can see if there's a new Expert stage?