There is no current way has to how to change your name other than restarting the game from scratch at the moment. But usually there is a pokesav that is released each time a new Pokemon game fully comes out in all countries, providing you have action replay ds you can just use the generated code to change your trainer name and rivals name if need be, Pokesav has many other features too.
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I believe you can change your "username," but not your screen name." It's unfortunate.
Yes.
You can't change your trainer name in any Pokémon games. If you're unhappy with the name you chose, you would have to restart your entire game, losing all Pokémon and items, to start over with a new name.
Go to your trainer card on the in-game menu (it's above the list of gym badges). Just under your name on the trainer card is a white arrow. Press it to cycle through a list of optional online avatars.
Howie is the name of the trainer who has a Pinsir on Pokemon FireRed. Pinsir is known for being a stag beetle Pokemon.