First HD jump for the main series. They should started totally fresh and have none of the other Pokemon. Build this up as Phase 2 Pokemon, which each group after this utilizing Pokemon introduced in Sword/Shield and it's sequels. Then, after like 5 generations have passed, we can have a mega crossover Avengers style game with all 10+ generations of Pokemon. It would make all the old ones feel new again after not having played them for so long.