3rd Gen Hardest Kanto Gym Leader ?

Which was the hardest Kanto gym leader for you. Give reasons also.
For me, it was Misty. When I first time played LeafGreen or first time played any pokemon game, I chose Charmander. Then, I did not know any basics of pokemon.My team was consisting of lvl 31 charmeleon and other pokemons in 10s. Misty keep Water Pulsing Charmeleon and he always die in 2 hits. It took 20 tries to get a lucky critical hit.

I can only think of Koga right now.
Misty wasn't a problem for me since I always had a pikachu.
As a kid I just couldn't get past that Muk.. My nightmare ;0

Misty was the because Starmie was just so strong;)

Usually I have trouble with Sabrina in RBYFRLG, but in GSCHGSS I have trouble with Jasmine.

For me, it's Misty. She's only easy if you choose Bulbasaur. Her Starmie is so freakin' strong O_o !

Misty, at that point in the game to have a Starmie is so difficult regardless of your starter choice.

Koga; because when I played FRLG the first time, I didn't use items or switch out, so I would just get badly poisoned and lose all of my Pokemon.

Misty because I had Charmander as my starter and I didn't train anything.

Having just replayed Fire Red, I can honestly say none of them were hard :x I was very under levelled when fighting most of the gym leaders and yet they were all easy D: I guess hardest would be Koga with his Weezing and Muk combo since I tend to train Grass, Bug and Poison types, but even he wasn't really a challenge.

I chose Misty because her Starmie is amazing and my favourite pokemon is a Charmander so i always choose it

Sabrina. My team has some trouble with psychic >''<
However, it's not too hard to surpass her.

I got stuck against Lt. Surge for a while, having no good rock Pokémon (I didn't bother training my geodudes) and my starter being Squirtle. Eventually, I was able to beat him with my wartortle. :3

none of them were too difficult, weepinbell easily defeated misty, sabrina was easy enough to defeat with bite or crunch (whichever I had at the time) Koga was easy if you get psychic at the game corner, I think I taught my starmie that.

I'd say misty was the most annoying because weepinbell was probably barely evolved at that point, and low leveled.

If we were talking about R/B/Y Erika would be the worst because of the constant status, and because of how over powered wrap was in the originals.

For me none of them were actually a challenge because of the team I had but I'd say Koga was the hardest.
I had Mankey take out Brock because I picked Charmander.
I knew Misty uses Water so I did the smart thing and caught me an Oddish.
Surge wasn't really an issue because I caught a Sandshrew and taught it Dig.
Erika was super easy because I had a Charizard by then.
Koga was annoying because I had an Gloom, Charizard, Vaporeon, and Sandslash. Weezings damn Levitate ability made it so hard.
Sabrina wasn't that difficult cuz I used Charizard with its increddible Attack and took advantage of her Pokemons weak Defense.
Blaine was easy cuz of Vaporeon
Giovanni was easy too because of Vaporeon.

I didn't really have that many problems because I had an awesome team that I loved, in the end this is what I had. This is during Elite Four.

Charizard
Vaporeon
Sandslash
Vileplume
Electabuzz
Gengar

I struggled with Misty(Starmie is way too strong for a 2nd gym) and Sabrina(Alakazam+Calm Mind=Scary) which I am not surprised by at all because they were a pain in the originals too. In the end, I voted for Sabrina because at least Starmie doesn't learn Calm Mind or am I wrong? I may have been playing since 98, but I still don't know everything.

Sabrina has always been the one I've been having the most trouble with. Usually I don't train any Dark or Ghost Pokemon, or teach any of my Pokemon those moves, so I usually have to rely on normal damaging attacks, and with her Pokemon being as strong as they are, it's really a pain to beat her. Misty has always been a bit of a pain, with her Recover spamming Staryu and Starmie, who are also able to deal quite a bit of damage to my Pokemon, though that's only whenever I don't choose Bulbasaur :P

I don't find any of them to be hard, really. :/ I never had much trouble in FRLG, especially since they gave Charmander Metal Claw to handle Brock. I'll just pick ummmmm...yeah no I can't pick lol. None of them are that bad. :( Sorry!

Yeah, I agree with Sydian. They were very easy gym leaders in FRLG. Back in the first gen Brock was hard if you started with Charmander but Metal Claw fixed that issue.

although I had pikachu Misty was pain in the ass
for me Koga and Sabrina were really easy since I've kicked Koga's ass with my kadabra and pwned Sabrina with my Nidokings megahorn