The Elite Four and Champions of each region are easily the hardest challenges to overcome. From Blue all the way to Hau, the Champions are considered the toughest trainers in every region. My favorite one is probably the hardest and definitely a cute one too. Yep, she hails from Sinnoh. Ladies and gentlemen, my pick here is...

Cynthia!

I mean, come on, how can I not pick Cynthia?! She has a Lucario, and her ace is a Garchomp! Need I say more?