I have yet to see any negative effects, but I suppose it's too soon to tell. I'll have to experiment with her abilities more and see what happens. Though, of course, there's still the fact that all illusions will wear off once she's been attacked, so she needs to keep herself from harm. That hasn't changed since her evolution. However, she usually conceals herself with said illusions, and I've taught her the move Protect, so that's rarely an issue.