Natures have been an important part of Pokemon for three generations now. However, URPG has not implemeneted natures outside of the Park, where they have minimal impact.
Obviously, natures leave a sizable footprint in battle. The transition from Generation II to Generation III should've made that very clear, and even if you weren't around for that, it's not too hard to imagine. Natures can play to each individual Pokemon's strengths, and it juices much more strategy out of battle.
The idea of implementing natures into URPG is very interesting. As I've already said, natures have been in Pokemon for a while. However, as far as I know (I can't see the mod boards), there has been no talk about bringing them to URPG. By now, shouldn't we at least give it a thought?
A lot of the same benefits natures introduced to battling in "normal" Pokemon games exist if natures were introduced to URPG. A new dimension would be added to battling, and it also helps distinguish Pokemon from others of their species in more ways than just nickname, gender, and the picture you have for them in your stats. It also makes having more than one of those Pokemon something to consider, which surely can't be a bad thing.
Here's a rough idea I have of what Natures may work in URPG. They'll be like gender in that a Pokemon can only have one, the Trainer gets to pick, and it is not changeable. For the sake of battling, maybe we could have someone implement a Natures list into the ref calc like what we have for Items or Abiltities. Then, when the Nature of a Pokemon is selected, then it will influence the stats accordingly.
If we do introduce natures (and I know it's still waaay too early to even think about that, but I think that this issue may be brought up in discussion otherwise), there may be some outcry from those who have already given their Pokemon natures for the purpose of the Park. If we decide to make the change, maybe it'd be fair for people with Pokemon that already have Natures that they may not want them to have in battle to change their Natures.
On another Park-related note that I can foresee as an issue, I say that maybe we should allow Trainers to decide their Pokemon's Natures like they do with Gender rather than letting the Rangers decide. I'm sure the Park mods won't have much of an issue with that, since, as I've said, it makes minimal impact in the Park as it is.
Well, that's all I have to see for now. This idea is just an idea, and even I'm not fully on board with it quite yet. However, I think a discussion would be interesting, so I'd like to see what everyone else thinks and how far this idea can progress. So..yeah