Spin-off games since the release of the first freemium Pokémon spin-off, Shuffle (February 18, 2015), that aren't freemium and/or exclusively on mobile, browser, or arcade.
>Pokkén Tournament (+ DX)
>Super Mystery Dungeon
>Rumble World (if you count the retail version that has all the microtransactions paid for)
>Detective Pikachu
>Mystery Dungeon: Rescue Team DX
>New Snap
>Detective Pikachu Returns
10 years, 5 games (+ 1 port), 1 de-freemium game, and 1 remake. If that's not enough proof that freemium killed Pokémon spin-offs, I don't know what else is.