5th Gen Who was the hardest Gym Leader in B/W?

Iris. Her and her Haxorus gave me quite a bit of trouble. Dragon Dances and Dragon Claws were deadly. I didn't have an Ice-type on my team (because I didn't want an Ice-type) nor Ice-type moves. Had to attempt the gym a few times before i finally defeated her. D:

Lenora wasn't too hard. Her pokemon hits strong, but my Lillipup hit stronger. (Y)

Elesa wasn't much of a difficulty too, just a little annoying with stupid Volt Switch. I didn't get a ground-type (because I didn't want to).

I would say Elesa was the hardest because I started off with Oshawott. Her Emolga outsped all of my Pokèmon's.

I hated Elesa's Emolga's Volt Switch. The others I can beat, one or two I need a rematch but Elesa took 15 times, my last go through.

For me it was Lenora and her Herdier, even with my Pignite that thing was hell incarnate.

None of them were too hard to beat which was a disappointment but the most trouble i had was with Brycen because i didn't have too many type advantages against him.

Lenora. Simply because I had to go and catch a Timburr in order to quickly defeat her. At least the first playthrough of my White. Second time was easier since I actually bothered to evolve my Tepig before dropping it for Darumaka. Other than that I didn't really have a problem with any of the gym leaders. Little disappointing but eh, it happens.

But... are there any hard gym leaders in BW? They're all easy to beat, in fact, this is one of the reasons that makes BW so easy. Yes, you may find a little trouble fighting one of them, but I'm sure they're not like Whitney's Miltank, for example.

I had trouble with Clay, simply because the only fire type I used in B/W was Litwick, which you catch afterwards. I usually have to evolve my Dewott before taking him on, or taking a hit to use revenge.

Hmm I would say Elesa. I think I caught a Sandile but I didn't have a lot of patience to train it. Darn Volt Switches and Static. Only in BW2 did I catch a Drilbur.
Oh, nothing compares to Whitney's Miltank. >:o

Clay was a ****ing nightmare for my team in B2 but since this is BW instead I'll have to say Iris since she was the first gym leader in a long time that's made me actually switch out members of my team just so I could beat her when I got to her.

Clay was hardest but still they were all pretty easy.