{For the most part, I actually try to keep my personal opinions off the blog to avoid coloring posts with bias and whatnot. This is partially because I want to make what Bill says feel genuine (either genuinely his opinion or genuinely something that would happen in his world) and partly because I know that a lot of my opinions are unpopular ones in the fandom, lol.
I think the one thing that’s nearly based on my own personal opinions are the jokes Bill makes about Unova. I’m a New Englander transplant to New York, so part of Bill’s jokes are really me fulfilling my obligations as a self-respecting Bostonian at heart to make fun of New Yorkers. It helps that this version of Bill is the animeverse British one, so the other part of it is Bill fulfilling his obligation as a self-respecting British-descended foreigner to make fun of Americans. (We swear, we still love you. Bill’s just salty that you threw his tea into your harbor, and I’m just salty that a slightly more specific you believes the Yankees are better than the Red Sox.)
Other than that, most of the laws, culture, human-pokémon interactions, and even the science and other odds and ends are really the result of a lot of research, rather than my own opinions, and as such, they’re basically what I think is true about the pokémon world. Either that, or they’re really what I think Bill’s opinions would be about different pokémon or facets of his world.
But the milk thing? The milk thing is canon.}
The Pokédex According to Bill 