How do you get the ep share on pokemon firered?

You can't get an "EP share" in Pokémon FireRed. There is no item or mechanic in the game that functions like that.

It's possible you're thinking of an item or concept from a different Pokémon game.

Could you please clarify what you're looking for? Perhaps you are thinking of:

* EXP. Share: This item is available in many Pokémon games, including Pokémon FireRed. It allows a Pokémon not in the battle to gain experience points (EXP) as if it were fighting.

* Evolution items: Some Pokémon evolve using specific items, such as a Thunderstone for Pikachu to evolve into Raichu.

Please let me know what you are trying to achieve, and I will do my best to help!