>>58547914For me, their biggest mistake was not using Misty and Brock as a plot device for Pokemon related to their specialties and related topics. For example, Brock could have explained the biology and care of Ground and Rock-type Pokémon, as well as some paleontology and mineralogy, since that was his hobby in the games. Misty could have shared interesting facts about aquatic Pokémon and all types of bodies of water in general (whether Water-type or not, as is the case with Dragonite), and she could have been the athlete of the trio.
Also, they would constantly rotated their teams. Brock using a Rhyhorn as a mount for the trio during land journeys, Misty had a fucking Lapras from day one for aquatic journeys (it didn't matter that it was garbage in battles), an episode with her training Ash's Kingler, another with Brock raising Larvitar and explaining how a terravore works, Misty having to take care of her sister's lazy Dewgong, and Brock raising a baby Geodude to give to his younger brother as his first Pokémon.
You get the idea, I feel like much more could have been done to avoid falling into the tedium of the Johto arc that killed Pokemania.