i dont think you can without an action replay
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The item duplication glitch (or Rare Candy glitch) can't be done in Pokemon FireRed version.
There is none without ar!
On the Action Replay.
you just cant
There is no stone but you can use a Rare Candy. That will make it go up 1 level, or you can get a Super Rare Candy. 1 in 100 games of Diamond, Pearl and Platinum have it replaced instead of the normal Rare Candy. Super Rare Candies make your Pokemon level 100 straight away, no matter what level they were on before hand.