Subject: It depends on its backstory
Author:
Posted on: 2015-06-02 12:25:00 UTC
If you're talking about a version from the video games, then Mewtwo is just a powerful Pokemon. There's no specific indication that it necessarily has any powers beyond that. In the anime, however, it's an incredibly powerful psychic, and having a Mewtwo agent would be a little questionable. But power levels aren't really all that important.
The main issue I see with that is its in-universe backstory, though. Where did this Mewtwo come from? Technically it's a unique Pokemon; there isn't really "a" Mewtwo in canon so much as "the" Mewtwo. It's not like a Pikachu or something where the character could theoretically be a "canon bit." So it would have to be a Character Replacement. This can be a good backstory, and also a way to tone down its abilities.
Overall, I guess what I'm wondering is why you want to write these characters. I've seen you talk a lot about their power levels - and they're all pretty powerful - but I feel like you haven't said much about their personalities. While I understand that you don't want to spoil things for us, it'd be nice to have a sense of what drew you to these characters in the first place. Otherwise, it comes off a little like you're only picking them because they're powerful.