https://community.pokemon.com/en-us/discussion/5585/what-spin-off-game-you-would-like-to-see-on-the-switchIts pretty difficult to think we eventualy get an Port of colosseum and gale of darkness whatever they gonna do i still trust them what they can achieve. The ports where largely rumored or hinted since the Wii U era due to the potential second screen was used there, but nothing ever came out since then. But never lose Hope. The big problem Is that genious sonority had been silently been on hiatus since last work on denpamen. I probaly think they still around but without the original devs Is unlikey would get these games on modern platform.

althought pokemon ranger would be great, it would require a new "Nintendo stylus" similar to the apple pen, which would imply more games with the same gadget (like a new cooking mama or other games of the DS era). so, my final answer is a new Pokepark (called of course Pokepark Switch).

the first pokepark wii was a good game, even a little bit challenging considering the use of the wii remote in the minigames, and it was a good spin off even for a kid audience, without a complex battle system.

Obviously Pokémon Mystery Dungeon

This is the only right Answer

Pokemon rumble

The Colosseum games could do with some modernising in a remake. Not too much... Just some graphics and QoL improvements. I would hate to turn them into completely different games or ruin the challenge.

Even if they were just ported, it would be nice if more people got to play them.

I suspect we will never get a third installment because the main series is on home console and in full 3D now. But a game with the characters and the Pokémon stealing mechanic could be interesting.