What IVs and EVs do NPC trainers' Pokemon have?

I’ve readherethat NPC trainers' Pokemon do have natures (from Gen III onward) and IV’s, and I’ve seen it mentioned in a few places that at least the Elite Four’s Pokemon have EV’s as well, but I’ve found no exact or even, seemingly, certain information on the subject. Basically, are NPC trainers' Pokemon’s natures, IV’s, and EV’s randomly generated, or, if they aren’t, what are they? I’m most interested in information pertaining to Emerald, but any such information pertaining to any of the other games would also be very much appreciated.Also, please cite your sources (or l33t hax0r credentials as the case may be).

Pleaselog inorregisterto add a comment.

Here’s an answer pertaining to Emerald.

All trainer Pokemon have a difficulty value between 0 and 250. The game takes that value, divides by 10, and gives them EVs and IVs equal to the result. Most trainers get 0 to 100, but the elite 4’s Pokemon all get a difficulty value of 250, so they get 25 evs and 25 ivs.

By cross referencing between thislist of all trainer dataand anIV calculator, you can confirm this.

I believe natures are assigned at random? They seem to be fairly random

TheIVsandNaturesare randomly determined, and the onlyEVtrained Pokemon are theElite 4and the Pokémon in thePWTinBlack/White 2.

Cynthia’s Garchomp, however, hasperfect 31/31/31/31/31/31 IVsinPlatinum. So… Yeah.

Source: Experience and Bulbapedia

In 7th generation at least, (I imagine this is retained in Sword and Shield) some Trainer classes do EV train their Pokemon. I know this because I was battling a Veteran with a level 36 Gabite. My Leafeon had 86 speed. Even with a Speed boosting nature and perfect IVs Gabite would top at only 82 speed and yet it outsped me. It makes sense veterans would EV train their Pokemon but I don’t know to the extent how much this applies to other trainer classes.

This spreadsheetandthis other spreadsheetshould have exact levels, natures, and stats for every trainer in Emerald. They unfortunately do not have exact IVs and EVs, so I guess you can try putting them inthis damage calculatorto estimate their IVs and EVs.source