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I count 50 evolutionary families (including UBs and counting Luna/Sol as 1). To compare XY had 37 (not counting Sylveon).
Including permanent form differences, Zygarde 10%, and Alolan Forms gives SM 66 new fully evolved Pokemon (not including Ash-Greninja) versus XY's 42 (including Sylveon, counting Meowstic twice, and counting Gourgeist 4 times).
