[Resources] Ryuutama Monster Design Guide
I know I posted this on the now defunct G+ page, so I'm posting it here now too.
A Google doc with some useful tables for monsters in Ryuutama, listing by Dragonica number (and what Dragonica numbers you can fill!), active season, etc.
Also has a break down of Monster stats by level to help you create your own homebrew monsters that are comparable to the ones in the book.