Okay, first, I'm aware that breeding isn't supposed to ever appear in the game. But still, it would be nice to at least giving me a try and read my suggestion. :3
I was wondering... What if breeding was allowed in the game, but at a cost? The rarer the pokemon is, the harder it will be to breed them and the more expensive it will cost. For instance, let's say I have a Rattata and a Sableye... And, for example, we need to buy a certain food for pokemons to make them breeding. Giving food to a Rattata and another pokemon would give a 50% of chances to make an egg after a certain time, and for the sableye, 5% after a longer time. (those numbers are, of course, just examples ^^)
This would keep rare pokemons rare, IVs and nature doesn't have to be inherited, so no OP pokemons, it would mostly be to add a feature to the MMO
I would also take the opportunity to talk about breeding to add another suggestion: jobs.
There are jobs in a lot of MMOs, so why not in Pokemon as well? Like... Limit players to a single job, and make jobs like... Breeding, crafting pokeballs, making some healing items from berries, hunter... for saying a few examples.
I'm aware that would be a lot of job though, but I would be glad if you at least think about it. :3 this pokemon MMO would become unique with this feature.
Thank you very much for reading me!