Click on the SAV tab, then select Inventory . Adjust item quantities to 999 .
Avoid setting key story items (like the Silph Scope or Poké Flute) to a quantity higher than one, as this can break script triggers in the game. pokemon fire red save editor
PKHeX is the most advanced and widely used save editor for nearly every Pokémon game, including Gen 3 titles like FireRed. Click on the SAV tab, then select Inventory