After the past few years I think gen 10 should be a big generation
1. Introduce a new system and still have the past gimmicks
2. Whole dex
3. Have every type combo
4. Battle frontier (never played it would be interesting)
5. Have dlc (idea to incorporate all past regions in it IDC if it's post game or throughout
6. Time travel to legend times
7. Have all popular characters cameo in each region dlc
8. Give every pokeball a type
9. Have modified online matches
10. Include any spin off game characters
11. Have a really good evil team possibly past the extent of rainbow rocket
12. Anime cameos
13. Island trials
14. Have a good plot like Gen 9
15. Have boss battle marathon either gym leaders legendaries etc