Of the studios that previously worked on Pokemon, HAL seems like an obvious first choice. However, if Star Allies in any indication, even the wizards at HAL are struggling with the Switch enough that they only got it to run at 30 FPS, less when the game gets busy. I would not trust Genius Sonority with Pokemon after what they did with Denpa Men either. As for new candidates, I wouldn't wish Pokemon on my worst enemy. Monolith Soft doesn't deserve to be shackled to Pokemon, and that would interfere with the Xenoblade franchise which is growing steadily enough. Platinum has only made one RPG (for the record, Infinite Space with some guys called Nude Maker?) but they're known for doing dirty deeds dirt cheap, so who knows what they could accomplish. I feel like the better alternative would be to re-instate whatever project that lead to the GameCube games, as that would help give GF enough of a gap to keep the games in the oven longer while somebody else does a twist on the usual formula without everybody panicking like the disaster that was Let's Go. I still don't know who I'd pick, but that's a far less bad situation for any of the above developers to be in.