When I say ecosystem not only do I mean the cash flow into the project, but also fair interactions between the game and players where it doesn't turn into Diablo immortal being pay to win.
There should be an item to purchase called Therapy, it changes the attitude of a revomon, it's nature. I think this would be fair, it isn't pay to win since the majority of the time the battle is finding a good IV revomon with the best ability, most of the time a hidden ability.
Not getting the nature after synchronize is just a kick in the teeth, one that, with a reasonable price on the mid end, say 20-40$, it could help the ecosystem!