PokéBase - Pokémon Q&A
6 votes
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Like Gym leaders, Elite 4...

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2 Answers

7 votes
 
Best answer

They will have natures and IVs because that's an integral part of the Pokemon data. The IVs are probably mediocre to avoid the game being too difficult.

However, Joey's Rattata in HG/SS and earlier games is specifically programmed to have near-perfect IVs. Hence he always says it's in "the top percentage of Rattatas".

Most of the regular trainers don't have EVs though, they act like "just caught" pokemon. I believe some of the more difficult trainers like the Elite Four do have some EVs to make it more difficult. And by that time in the game all your Pokemon should have naturally acquired all their EVs.

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Cynthia's Garchomp has perfect IVs and EVs. Explains why it is one of the most powerful Pokemon I have faced in the games.
Cynthia's Garchomp has 30 IVs and 0 EVs in every stat, according to this spreadsheet: https://www.speedrun.com/pkmnplat/guide/8pivp
2 votes

Most regular trainers have 0 IVs in every stat. The more important trainers, like gym leaders, antagonists, and Elite 4, usually have higher IVs. Every Pokemon in gen 3 onwards has a nature, but the trainers' natures all seem to be completely random. I have seen no evidence that stronger trainers' Pokemon have better natures. Also trainers that you battle multiple times, like rivals, sometimes have different natures on the same Pokemon in different battles.

Gen 5 is the first generation where trainers sometimes have more than 0 EVs.

source: clicking different Pokemon games on this page, clicking either "guides" or "resources", and looking for trainer data

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