Dallas

Team:
Rapidash (55): Flare blitz, Bounce, Fire spin, Megahorn

Darmanitan (55): Belly drum, Superpower, Taunt, Thunder punch

Heatmor (55): Inferno, Amnesia, Stockpile, Swallow

Magmorter (55): Fire blast, Sunny day, Earthquake, Hyper beam

Flareon (55): Last resort, Flare blitz, Quick attack, Iron tail

Flarfly (58): Bug buzz, Fire ball, Flash, harden

You get nothing but money from elite four members

Fun fact: If you manage to beat all the gym leaders, including the version exclusives, you can skip her.