{To the easier of these two questions, alas, no. I would love to see someone try, though, and on that note, submissions are still open, and the post in question is somewhere in the Dragonite tag. I’m just sayin’. 😉
On the harder and more serious of these two questions, I think it’s more about variety than anything else. Sometimes, when I get a question, I’d actually get something like five or so of them, either intentionally (like how I currently have five asks I’m working on for facts related to different species because of the Decidueye fact post) or unintentionally (the numbers of times people ask about how to take care of standard/Alolan Vulpix at the same time or what happens when you have them mate with each other). Don’t get me wrong; I enjoy answering these asks. It’s just that after a while, they get harder to answer because I feel like I’m going through a template of sorts. That’s why I tend to stall out on questions about caring for different pokémon and why I might skip around the ask hopper a little.
If I had to choose a specific topic, though, I’d probably say more worldbuilding asks. Like, not necessarily “tell me everything about this city” so much as “hey, I have this specific not-necessarily-pokémon-related interest; what can you tell me about it?” I’ve always been fascinated with worldbuilding/building societies and cities and whatnot, so the sorts of questions that make me go deep into the setting itself are just fun, even if I fully acknowledge the fact that Bill probably doesn’t know everything about those topics. Or if he did, he might not always speak of them favorably. (Looooool, his opinions on Unovan politics are pretty much “it’s a garbodor on fire; next.”)
Also, full disclosure: asking Bill or Lanette personal questions is like free license to stan, so that’s always fun.}