Favourite rival?

[Bubble Ba'ath]

Marnie because of how she is so different to how her fans act and having an epic team and wearing such an awesome jacket that screams legend.

 

[Pokefan_1987]

The cartoon version of May for me in (Hoenn has so many of my favorite designs) Her temper when Team Rocket stole the reward food is similar to my own but i avoid yelling actually. (And her fathers voice by extension by Dan Green in the episode where the fireworks were ruined)

 

[Luthor]

Generally when I think of rivals I think antagonistic rivals so I'll say Silver, as he was fun to beat.

 

[Victreebong]

I like Hugh’s outfit and style the most.

Nemona so far is the best rival we’ve received. Most developed, most supportive, definitely the most talkative. Lots of postgame storyline. And those freckles! You just can’t compete with that.

 

[ceruleangirl17]

Gary/blue,for some reason i always found him funny

 

[Vlachya]

Gary was so cool and snarky, he was a character you love to hate. I miss rivals like those.

 

[camdudetenger2018]

well there was

gary oak vs ash catch em rivalary
jessie and james vs ash misty and brock rivalary
jessie and james vs butch and cassidy rivalary

 

[RealityTVRebooker]

It is difficult to do better than Gary. If we're honest, but there probably are some contenders I am forgetting about.
Maybe Misty and her sisters?