BlackButterfree
Well-Known Member
With 81 new Pokemon in a region as big as this one, would you rather have 162 Pokemon in the overall Regional Dex? That's 81 new and 81 old. Both even. Not enough to liven up the region if you ask me.
Honestly, a regional dex (not just the new batch, but the overall dex, mind you) only needs to represent each of the 18 types enough for someone to make a full team of six of that type (for hypothetical rematches with E4, GL and Champion). That's 108 in the Dex if you just use 6 stand-alone Pokémon of each type. If you include 3-stage families and dual-types, you could easily get by with like 250 Pokémon in a regional Dex.
Hell, if you include cross-generational relatives from Generations 3, 4 and 6, and include Mega Evolutions and Alolan forms, the Johto-Kanto Dex is the ideal. Appropriate amount of type distribution, a large number but not obscenely large, a 2:1 old-to-new ratio, etc.