You cannot progress through the game or get to other regions without beating your rival in the Pokemon game. It is specifically designed so you have to battle and beat your rival.
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You get it as a prize from beating your Rival at Silph Co.
Your rival will give you fly after beating him/her near the weather institute.
In LeafGreen/FireRed, you get cut on the S.S Ann from the captain after beating your rival.
After beating the Pokémon League, your rival will escort you to the Hall of Fame.
In the Japanese opening to Pokemon Chronicles: "The Legend of Thunder," your rival (referred to as Silver) can be seen beating the crap out of Jimmy and his Pokemon.
sadly, no, I hve tried
By beating the Pokemon league 20 times.
Without a context or another religion, it would be impossible to say who the rival is.
City Without A Rival.
You need to get the Pokemon that are super effective against the Elite Four and Gary, (your rival) the champion
After you receive your own home in the resort area, focus on completing your pokedex and beating your rival's high score at pal park.