This is the data I collected by doing a quick amulet and looking up every trainer in Johto, and finding all the trainers that paid well.
It might not be fully precise and I may have missed on a lot of other trainers, so please let me know and I'll try to update ASAP with all new info. I'll do further research myself too.
Also, I'm not including caves or mountains because I think we're all too lazy. // No incluyo cuevas o montañas porque es demasiado tedioso y creo que todos somos flojos.
Huge thank you to @SecretSaint for giving me most of the info of how much each trainer pays!
Notes:
All of the money that each trainer gives were made without any charm, donator status or amulet coin. Do keep that in mind. // Todo el dinero que da cada entrenador fue calculado sin ningún tipo de amuleto, estado donador y sin Mon. Amuleto. Ten eso en cuenta.
Screenshot Guide: