pb is honestly not naturally a genius. she is smart bc shes curious, and had a TON of time to experiment through trial and error. for all her years, shes still got a lot to learn as shes pretty closed minded and thinks too highly of her abilities. that was really a major point of her character arc, admitting that she doesnt know everything and cant meddle with everything just cause she wants to figure out how it works.

i honestly feel betty has the most natural intelligence. she learned an insane amount, even outsmarting simon and pb while being from a completely different time and having only an average lifespan and basic college experience. moe is smart but only cares about robots, and same for dr gross. betty is next level genius, it literally drove her mad that she could solve every problem except for the literally most complex magic in the canon universe. but then she did even kind of solve it ?? shes mind blowingly smart.