Who do you think is Ash's worst rival?

[Exzessiva]

Gary is the best rival that Ash has got, that's mostly because they are both from the same town.
In my opinion Gary is a much more better trainer than Ash is.
I admit that Gary is quite arrogant but he has skills also as a trainer. But now he is much more decent than he was which is due to his lose at the pokemon League and his over-confidence getting shattered.

 

[Blizz]

I think that Paul was the worst. He was rude to him Pokémon and Ash. Also Paul is so irritating.

 

[Yoshikko]

For me that will always be Gary. Gary was always one step ahead of Ash in the original season and I just love his character. Even with the GS ball they were rivalling.