The most beautiful part of @yamujiburo hanamusa's lore for me is Ash's emotional evolution and acceptance. For a character that surprisingly did not evolve much in its own journey (in a show full of evolutions) and made the same mistakes year after year, this proximity with Jessie is my most expected part of this story
I like to think that Arbok's hood patterns are influenced by their environment. When they evolve, they can take on the markings of their parent, or maybe they take after the trainer who raised them (who may or may not have an intimidating look to them)