What are all the version- exclusive trainers?

Question

Version- exclusive as in only in one of a duo, trio, or quartet of games, such as a trainer being in scarlet but not violet, or crystal but not gold or silver.

Comments

Are you counting trainers you see (e.g. Courtney is battled in Ruby but only seen in Emerald)?

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Not sure what you mean by quartet of games, are you referring to B/W and B2/W2? Completely different games, not different versions.

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@ J™ yes that does count. As for your question, @Hellfire Taco, i was kind of thinking in terms of generations and storylines. For example, Red, Blue, Green, and Yellow, the ones I specifically had in mind, all follow the same story, so that would count as a quartet of games in my mind.