It's not in the game.
veridian forest, or the power plant
you cant its in firered in the forest
to the forest
Viridian Forest or the Power Plant.
Ilex Forest in not in Firered. Ilex Forest is located in Johto. It can only be reached in Gen II or in the unreleased Heartgold and SOulsilver in Gen. IV.
It is not possible to visit Ilex Forest in Pokemon FireRed as it's a location exclusive to Pokemon Gold, Silver and Crystal. Pokemon Gold, Silver and Crystal are the only Pokemon games that let you visit more than one Pokemon Region.
Search around in the berry forest.
They are found in Viridian Forest, but are rare.
You can catch Pikachu in Viridian Forest and at the Power Plant.
You pick em up in the berry forest
In Pewter City, past the Varidian Forest.
(Pewter city) through Viridian Forest
go through viridian forest
In Pokémon FireRed and LeafGreen, Kakuna can be found in Viridian Forest, Route 25, and the Pattern Bush.
You can catch it in Viradian Forest at about level 4 or lower.
go on 3rd island and look in berry forest
in Pokemon heartgold, soulsilver, firered, and leafgreen it is north of Viridian city
She is in Berry forest but when you find her you must face a Hypo
I caught one at level 3 in the Viridian Forest.
You can get a iapapa berry from lostelle at berry forest also possibly from a Pokemon that has the ability pickup.
Pikachu can be found in viridian forest (very rare) or in the power plant.