Oh, God, why do I keep forgetting about this thread.
Raichu: During the Thunderyu battle, you and Jolteon teamed up to sap the electricity from the funnel cloud, but you don't have the Volt Absorb ability. How could you do it? Is this a trait that all Electric Pokémon possess, or does your absorption differ from Jolteon's? If it does, how?
Raichu: We were just gathering the electrical energy to be able to use it to power our own attacks. Any Electric Pokémon can do that.
(Volt Absorb is the ability to use absorbed electricity for healing and had nothing to do with what they were doing there.)
Scyther/Razor: You mentioned in Ruxido that you used to slash through tall grass for fun (or training, I can't remember which). Did you ever accidentally slash a wild Pokémon? What happened if you did?
Scyther: Slashing grass is loud; normally the wild Pokémon would have plenty of time to get out of the way. But if you did accidentally hit something, you'd eat it, or take it back to the swarm and share it if you weren't hungry.
Racko: Have you chosen to stay as a Grovyle, or are you not powerful enough to evolve into a Sceptile?
Racko: I just like this form! I'd feel naked without my wrist leaves.
(IALCOTN) Mark: The school you go to has a Porygon to help with grading tests; how can it stay in Sailance without becoming debilitated and tired? Or can it avoid this by converting itself to computer code?
Mark: The Porygon are just in the computers, and presumably the Effect wouldn't reach them there. I don't think they ever take physical form.
Mark's Sandshrew: How many moves do you know?
Sandslash: I don't keep count. Fifteen, twenty?
(As I keep saying, asking the characters is not the best way to find out factual information. He knows Sandslash's natural level-up moveset plus Rock Slide and Aerial Ace, unless I've forgotten some off-hand mention at some point.)
Pamela: Do you use ranged moves (Thunderbolt, Shadow Ball, Round…) often?
Pamela: Sometimes. Alan likes Swift and Power Gem.
Victor: Do you think Mutark's ability to grow in size and power is a way of making up for it's lack of evolution? And I don't recall, is yours male or female?
Victor: Precious is male. I wouldn't say it's a substitute for evolution, per se; its utility is quite different, since it relies on enticing the opponent to underestimate it before it grows.
May's Stantler: You said you're a mother, how long ago did you have your baby? And have you had more than one?
Stantler: I had one calf, some five years ago, after my trainer died.
to Mark, May and Alan: What's your favorite species of Pokemon and why?
Mark: Lugia and Articuno.
May: Skarmory.
Alan: All Pokémon have their own strengths and weaknesses, and they're all their own individuals to be judged on their own merits, not their species. The idea of having a favorite Pokémon rubs me the wrong way - like having a favorite race of people.
(Mark's) Charizard: In the event of a battle between Charlie and yourself, who would be the victor?
Charizard: Probably Charlie. He is older and has more experience.
Mark/May: Have you considered buying or stealing a Pocket Healer? Seems that it would be awfully convenient.
Mark: Well, they're really hard to get and limited in scope, since they can only heal mild injuries - they're basically like a Max Revive and Full Restore in one. Serious damage like legendaries can do mandates proper Pokémon Center care.
May: Is it possible to hold a normal conversation with Mutark in any of her forms?
May: Kind of, but she only transforms during battle, so there isn't much of an opportunity for it.
Female Color Dragons: What do you suppose your male siblings are up to?
Raudra: They're scheming to leave us powerless and have us grovel before them as they rob us of our homes and mock us and slowly kill us!
You can't ask the male color dragons or the Destroyer, because they haven't appeared on-screen in the story (or, in the Destroyer's case, you at least don't know that he has), one of the requirements for being able to ask questions. Furthermore, all information I'll answer regarding the Destroyer in Ask the Author, etc. is basically channeled through Chaletwo - I'm basically telling you his beliefs about the Destroyer -
and even if you could in fact ask the Destroyer questions, this would still violate the rule about not giving characters important information they may not actually know in the story.
