I prepared this post for unpopular opinions, because I feel like Pokemon reuses the same Pokemon families for every regional dex.
As I went through the data, I was surprised to learn that only a handful of Pokemon have only been in one dex, and many Pokemon have been featured in multiple regional dexes. For a cast as big as we have, I thought this was pretty cool. I'm not factoring in starters or legends into this list as they're special and intentionally linked to specific regions (unless you're Kanto!).
Poor one out for poor Stantler, but I'm pretty surprised the list from the older games is only that short. Even the ones here tend to be available in other methods (swarms, PokeRadar, Friend Safari) so it's not like anyone really gets forgotten.
...unless you're Glameow or Purugly
As I went through the data, I was surprised to learn that only a handful of Pokemon have only been in one dex, and many Pokemon have been featured in multiple regional dexes. For a cast as big as we have, I thought this was pretty cool. I'm not factoring in starters or legends into this list as they're special and intentionally linked to specific regions (unless you're Kanto!).
Stantler
Shroomish, Breloom
Cacnea, Cacturne
Kricketot, Kricketune
Shinx, Luxio, Luxray
Glameow, Purugly [might be the least available Pokemon ever when taking age of origin into play - only in Pearl and ORAS]
Spiritomb
Blitzle, Zebstrika
Sewaddle, Swadloon, Leavanny
Deerling, Sawsbuck
Tynamo, Eelektrik, Eelektross
Bouffalant
Scatterbug, Spewpa, Vivillon
Skiddo, Gogoat
Shroomish, Breloom
Cacnea, Cacturne
Kricketot, Kricketune
Shinx, Luxio, Luxray
Glameow, Purugly [might be the least available Pokemon ever when taking age of origin into play - only in Pearl and ORAS]
Spiritomb
Blitzle, Zebstrika
Sewaddle, Swadloon, Leavanny
Deerling, Sawsbuck
Tynamo, Eelektrik, Eelektross
Bouffalant
Scatterbug, Spewpa, Vivillon
Skiddo, Gogoat
Pikipek, Trumbeak, Toucannon
Yungoos, Gumshoos
Crabrawler, Crabominable
Oricorio
Rockruff, Lycanroc
Fomantis, Lurantis
Comfey
Sandygast, Pallossand
Minior
Komala
Bruxish
Yungoos, Gumshoos
Crabrawler, Crabominable
Oricorio
Rockruff, Lycanroc
Fomantis, Lurantis
Comfey
Sandygast, Pallossand
Minior
Komala
Bruxish
Poor one out for poor Stantler, but I'm pretty surprised the list from the older games is only that short. Even the ones here tend to be available in other methods (swarms, PokeRadar, Friend Safari) so it's not like anyone really gets forgotten.
...unless you're Glameow or Purugly