How do you duplicate your rare candy in Pokemon FireRed?

It's impossible to duplicate Rare Candies in Pokemon FireRed through legitimate means.

There are no in-game glitches or methods to duplicate items, including Rare Candies.

The only way to obtain Rare Candies in FireRed is through the following:

* Defeating certain trainers: Some trainers, especially the elite four, will reward you with Rare Candies upon defeat.

* Trading: You can trade for Rare Candies with other players.

* Using the Game Shark: This is a cheat device that allows you to manipulate the game, but it's not considered legitimate gameplay.

Be aware of scams and hacks: Beware of websites or individuals claiming to have methods to duplicate items. These are often scams designed to steal your account information.

Focus on legitimate gameplay: The best way to obtain Rare Candies is through playing the game as intended.