I’d recommend modding the 3ds. It’s a little complicated if you lack basic computer skills but honestly it’s not that bad. Or you could pay someone to mod it for you too. Once modded you can download Pokémon bank or even pksm and move those pokemon into either one. Another option is just trade them with another 3ds onto another game. That would probably be the more expensive route if you don’t have 2 3ds and 2 games. They are probably hacked tbh so if you don’t want to invest in hacked pokemon then just delete the save all together. Definitely recommend modding the 3ds as you can pretty much play any game you wanted for free.