KMS 1.2.189 - Skills!

If it is different, I wouldn't immediately assume multiplicative, but it's a possibility.

Anyway, we don't have Supreme Badges, we get Totems from Red Leaf High. They're completely untradeable, but we can wear three of them. They're unique equipped, though, so we usually wear the top three in a category, and their stats correspond to your Advance, Supreme, and Royal badges, so wearing all three, we get (12 + 20 + 14) Main Stat and (3 + 6 + 4) ATK, and it costs 1b total (100m+400m+500m) to get all 3.

I knew it, no wonder I feel weird typing those.