How many rivals have there been in Pokémon games?

Question

E.g. May

Side games count.

Comments

Others not currently mentioned in the answer: Hop, Bede, Marnie, Klara, Avery, Paulo, and Keith.

Answer 1

Green/Blue, Silver, Brendan, May, Wally, Barry, Cheren, Bianca, Hugh, Calem, Serena, Shauna, Tierno, Trevor, Hau, Gladion, Trace, Ronald
source

Comments

Who's Ronald and Hugh?

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Hugh is from Black/White 2. :P

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Ronald is from the tcg video games

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Okay thanks.