Decided to rate every Pokemon from 1-10, then count up the 8/9/10s to find out which region has the best Pokemon. 8=+1, 9=+2, 10=+3

Gen 1-67 points
Gen 5-67 points
Gen 7-60 points
Gen 8-54 points
Gen 2-48 points
Gen 9-45 points
Gen 3-43 points
Gen 4-38 points
Gen 6-18 points

Counting 3/2/1s as -1/-2/-3 points though personally I don't think that makes sense to do as I care more about Pokemon I like than Pokemon I hate

Gen 1-62 points
Gen 2-44 points
Gen 7-43 points
Gen 3-38 points
Gen 5-30 points
Gen 9-27 points
Gen 4-26 points
Gen 8-23 points
Gen 6-6 points