I'd say this can be considered a Mechanic, techically.
It just crossed my mind, since the rival in Let's Go Eevee does evolve Pikachu in Raichu, I wonder, does the rival evolve Eevee in Let's Go Pikachu? If he does, does it follow the same pattern of evolution of Yellow (where the evo depended on if you won or lost to him during the story) or is it fixed, or even random=
It just crossed my mind, since the rival in Let's Go Eevee does evolve Pikachu in Raichu, I wonder, does the rival evolve Eevee in Let's Go Pikachu? If he does, does it follow the same pattern of evolution of Yellow (where the evo depended on if you won or lost to him during the story) or is it fixed, or even random=