User blog comment:A Graalian/Who would you rate the hardest Zombie in PvZ2 and OP plant in PvZ2?/@comment-4417029-20150407152225

This may sound exaggerasting but...for zombies, Imp Dragons. Why? Freakin. Fire. Immunity. That's why. Not even Cherry Bomb can stop this bozo.

As for plants, I think..hmmm. perhaps Ghost Pepper. She makes Dark Ages easy (the main levels, of course). Hurray for anti-nuetralizations.