>>29412575Mega Gyarados, Primal Kyogre, and Mega Steelix stop existing, as well as many more forms
It's now impossible to evolve Porygon, Porygon2, Seadra, Onix, or Feebas (by trade, at least) and still more I can't think of off the top of my head
You can no longer breed Mantyke, as Mantine cannot hold the incense
Finding extra Metal Coats in the wild is impossible now since Magneton cannot carry them.
Black Sludge becomes less useful by a long shot.
Although Doublade is a shit example for the OP, since it uses its tassles like hands
