Ash's Strongest Rival?

Which one of Ash's rivals from the past that do y'all think is the strongest of all from before?

I dont know i think all of them were strong but not strong enough

I think Harrison is Ash's strongest rival

Cameron was a good rival to Ash he beat him at the semi-finals tournament

If only Tobias was one of Ash's rival, then I would say that he's the strongest of all Ash's rivals thanks to his Darkrai & Latios. That's just my opinion......

Darkrai is awesome. Personally one of the awesome dark pokemon it suits it

GARY MOTHER *Beeping* OAK

COME ON NOW

Gary Oak

Shiro wrote:

GARY MOTHER *Beeping*  OAK

COME ON NOW

True Gary was very strong he was a tough person to beat

I guess Gary Oak is far more popular as Ash's rival since he has lasted long enough until he was defeated by Ash and eventually gave up becoming a Pokemon Master and decide to become a Pokemon Researcher like his grandpa, Professor Oak.......

Following in his footsteps although i hope they could meet again be nice to see what he look like now and ash will still look younger than him lol