[spoil]Dragonfree to Chibi Pika: Yes, definitely dead.
Dragonfree to Chibi Pika (again): Yes. I like to picture all of them as one-of-a-kind - apart from Rick's clones, of course.
Chaletwo to Chibi Pika: No.
Mewtwo to Chibi Pika: Of course I am, how else would I have been in the book?
Dragonfree to Chibi Pika (yet again): I can't answer that question. You ask if things are possible; well, everything is possible. But only one thing really happened.
Chaletwo to Chibi Pika: Yes, I can time-travel, and yes, that is possible.
Dragonfree to Chibi Pika (still one more time): No; in fact, I'm relieved that somebody is still wondering about the Mewtwo-wasn't-created-yet thing. But if you want to do more theorizing, by all means put it in spoiler tags.[/spoil]