Each of us knows that after leaving the SS Anne, the ship sets off on another journey around the world and never really returns, but it would probably be nice if the ship came back to Vermillion City.
My proposal is for the SS Anne to return as an event whether weekly, monthly, or at an interval decided by the game developers. I remember reading on the chat once that Generation 7 was supposed to be introduced to the game along with the addition of the Astrella region. Unfortunately, as players, we don't know when the new region will be added to the game.
However, I have a suggestion: when the SS Anne returns to Vermillion, it could feature entirely new trainers with Pokémon from Generations 7, 8, and 9. After defeating these trainers, they could randomly reward players with a Pokémon from those generations (of course, not all trainers would give Pokémon only selected ones).
I also thought of another way to obtain these Pokémon, such as mini-events where a random abandoned Pokémon jumps onto the ship, and we could adopt it. Additionally, new bosses could be introduced, who would reward players with Pokémon upon being defeated.
I have one more suggestion, which is not related to the SS Anne. Could you add a Pokémon on Route 21, between Pallet Town and Cinnabar Island, that would teleport the character from one end of the map to the other?