Idea #1: Torque
Remember torque moves? (You probably should) The moves learned by the starmobiles? I thought something different of it. I decided to make them available to all Revavroom. There is also a torque for all 18 types (e.g. Electric=Shocking Torque, Bug=Swarming Torque.) The torque moves types are defined by the Revavroom's tera type. So, a Revavroom with a poison tera type can learn Noxious Torque, but if it's tera type changes to normal, Noxious Torque will be replaced with Basic Torque. it's a bit like Tera Blast, but there are some differences. First, the torques can only be learned by Revavroom. Secondly, Revavroom doesn't need to terrastalise. Finally, the different torques have adverse effects based on the type.
Idea #2: Amoongus
An idea of a reigonal Amoonguss would be cool. I would make it poison, fighting, and it would have a brown and grey colour scheme. In the reigon where the reigonal Amoonguss is, you catch Foongus and it evolves at level 30. However, when Foongus evolves, the pattern on Amoonguss's caps will depend on what pokeball you caught Foongus in, and this will affect Amoonguss's stats.
Idea #3: The Grand Finale.
Let's assume Pokemon reaches it's final generation. I would like to see the final Pokemon game to be a large open world game with access to all reigons to explore. You start in Kanto, but you can unlock more reigons and get a starter from each one.