I would have thought that would be obvious.

[The sarcasm there is downright vicious, but he continues after a moment.]

I'm not concerned about you losing. I'm concerned that your Pokémon will be recognizable and will be traced back to you. I'm even more concerned that someone will recognize your voice. Just how do you plan on ordering your Pokémon around without giving that away?

[Hopefully not with a Psychic-type, since that would leave you short one team member.]