Which Frontier Brain do you like most?

Out of the available Frontier Brains, who did you like the most? Did you manage to battle them, and was it tough? What do you like about them?

I've always liked Darach, He was cool in the manga and I find it cool that Caitlin eventually became a elite four member.

I only ever saw Noland and Lucy... I think. I wasn't that much into the Battle Frontier and did not spend much time there.
For the Sinnoh/Johto Frontier Brains, I've never even seen any of them. I never bothered with the Battle frontier in gen 4 at all.

I'll just go with Lucy I guess... From the Hoenn Battle Frontier facilities the one I spent the most time at was the Battle Pike... though that's not saying much =P

Palmer from the Gen 4 Frontier. He's the only one with a real backstory and it's pretty cool that he's Barry's dad.

Lucy on looks alone. Never encountered any of these trainers. (Owned neither Emerald, Platinum, nor Heartgold/Soulsilver. Had Gold, Crystal, Sapphire, and Diamond. Made no sense to buy them.)

Arcade Star Dahlia from Platinum is easily my favorite. Her battle facility had this really fun randomizer & roulette component to it, and I just love her style.