Which single trainer gives the most money in each core series game?

Question

Base please, not including Amulet Coin, Happy Hour, etc.

Comments

Apparently it depends on the trainer you're fighting and the level of the last Pokemon in your party (the latter of which I personally think is kinda dumb).

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Isn’t it the opposing trainer’s last Pokémon, not yours?

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that is correct, thecarnapper5

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is it the champion? IDK

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Whoops, my bad.

Answer 1

This answer is missing LGPE information. If you're not okay with this, then just tell me, and I'll convert my answer to a comment.
RBY: rival (as champion)
GSC: Red
RS: Steven
FRLG: rival (after Sevii Islands)
E: Wallace
DP: Cynthia
Pt: Cynthia (after Stark Mountain)
HGSS: Red
BW: tie, Alder and Cynthia
BW2: tie, Benga, Janna, Jariel
XY: Diantha (Black Writ)
ORAS: Steven
SM: Red
USM: Giovanni
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