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The constant introduction of new evolution mechanics to explain why old pokemon couldn't evolve breed in past games
>Have to explain why Magneton/Nosepass couldn't evolve before so now they have to shove a magnetic area into every game
>Have to explain why Eevee couldn't evolve with a leaf stone before so have to shove a mossy rock in every game (and an icy rock cause it came as a pair)
>Have to explain why you couldn't breed specific baby pokemon before so have to give each of those evolution lines their own specific incense
>Can't have the incense be one item in case new babies are introduced
There's so much shit like this. Thank god they retconned Leafeon/Glaceon to Leaf Stone/Cold Stone in Sword and Shield (Though who even played Sword and Shield) and changed Grubbin to Thunderstone so presumably Magneton and Nosepass will be too, but the incense shit is still a thing and there's so much more.
They just barely escaped making Runerigus a federal issue since its retardedly location specific evolution can only happen in Galar anyways.