Curate, connect, and discover
I actually kind of like how gen 1 pokemon handled the elite 4. Having a team roughly based around the trainers’ type alongside their personality, but not having it revolve entirely around 1 type allows for a lot more variety in team composition, which naturally lends itself to needing more complicated strategies.
It makes me think about how far an elite 4 with teams solely based around the trainer's personality can go. For example an astronomer trainer who uses a team of space related pokemon like Clefable, Minior, Starmie and Beheeyem.
Or a historian trainer with a team of Golerk, Spiritomb, Relicanth and Sigilyph. Pokemon with significant and also mysterious historical value.
I just think it’d be pretty neat. I’m interested in what could be possible if most major trainers weren’t relegated to using 1 type each.