[Yusuke doesn't even blink. He looks her right in the eye and says:]

Yeah, we'll see about that.

[He cracks his neck. He isn't necessarily taking her completely seriously right now, but he certainly feels better now that he's told her, in no uncertain terms, that he'd oppose her if she did try something. Whether or not she takes the sentiment to heart isn't his problem.]

You might wanna track your Pokemon down before you start planning your little take-over. Can't do the bad guy thing properly if you don't have any stupid-lookin' minions.