Never forget the power of long term merching. I made millions logging in game once a year selling old vanities.
Ironically best money making is not playing the game.
Lore-wise we have 3 mothers already and a gym leader father.
On topic, additional breeding method is not needed. It will make an inflation of rare species with low encounter rates in game
If something like-"rare pokemon can't breed with this method" is done then it might be possible. I don't see any other way.
Watched net juu no susume, loved it.
Plan to watch this one coz isekai animu.
https://myanimelist.net/anime/34497/Death_March_kara_Hajimaru_Isekai_Kyousoukyoku