>>38090443> Gen 1- Semi Non-Linear
- Secretive Pokemon Locations
- Safari Zone
> Gen 2- Sidequests
- Present World Building
- Exp. Share
- National Park
> Gen 3- Battle Frontier
- VS Seeker
- Environmental Cohesion
> Gen 4- Underground (rework the online)
- Route Layout
- Following Pokemon (beyond the Starter)
- Pokeathlon
> Gen 5- Higher Quality Storytelling
- Unique Environmental Design
- Increased Character Interaction
- Controlled Levelling Curve
- Pokestar Studios
- Pokemon World Tournament
> Gen 6- Mega Evolution (could use iterative improvements)
- PSS System
> Gen 7- Regional Variants
Things that should in some form or another be retained across the generations, some things like the mini-game stuff (Safari Zone, National Park, Pokeathlon, Pokestar Studios) could be rotated around but iteration is what Game Freak needs at the moment, not throwing out every idea in the following generation.