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Living in Pokémon post-Dexit means there's actual rosterfagging like in Smash Bros and slots actually matter.
What was the point of including garbage like Victreebel in SV, when in ZA it could have had a more favorable spot? Or how Dewgong was in Indigo Disk, or Mightyena in Teal Mask.
Even Game Freak acknowledges this, that's why many Kalos-themed lines are were missing from SV.