Probably. We should've already seen it coming when they had two Urshifu forms based on powerful or swift attacks and then made that gimmick in the TCG by having cards labelled single or rapid strike.
Predict 9th generation gimmick
High Pokemons where the Legendary Pokemons are shoved into one Pokemon body.
You can only have 2 pokemon in your team
you can switch in and out at will
think mario kart double dash but pokemon
or whatever gimmick that doesn't just make Pokemon bigger
Combination attacks: they were half implemented in rs but done better now, the game should be doubles focused too
Example:
Fire Blast/Flamethrower + Whirlwind/Hurricane = Blaze Tornando (once you choose the last move a message will appear: would you like to use [combination attack]?
The gimmick could be they are OP damage wise and could set up status or debuff/buffs too while dealing damage but are low priority and you are fucked if one pokemon faints before it (the move failed), high risk high reward
They should also work like Flying press type wise
Considering all the recent shit
Armor
Fusion
Burst evolution
human fusion tied into gen 5 remakes
Shrinking as opposed to dynamax
I don't think they could do procedural fusions well. It would have to be a few custom-made ones, which could be awesome but honestly it would probably just be megas with extra steps.
Something dynamic and universal. They've been moving in that direction. Megas were for only certain Pokemon, then they made it so anyone could use Z moves. You used to need a hold item to use the gimmick, but now with Dynamax you can do it any time so you no longer have the problem of being forced to bring your gimmick mon to a bad matchup.