That character doesn't exist in firered. He is only referenced by a scientist in the Rocket Warehouse on Five Island here's the quote: "You look a lot like Giovanni's kid but he has red hair."
He can be found at the game corner, silph co and the viridian city gym.
on island3 in the garden then go to the top right hand corner of it youll see a little girl when you go to here a hipno will come out defeat it then talk to her
Silver from G/S/C (gold,silver and crystal)
in island 8 by using cheats
in viridian gym
in the vedirian gym
Its in Viridian City, the Earth Badge, vs. Giovanni
he is in the Pokemon tower you have to beat Giovanni in the arcade in ceadon city then you get the sliph scope to look a ghosts
Silver, the rival from the Gold, Silver and Crystal games has been confirmed as being Giovanni's son through a special event in HeartGold and SoulSilver.
If you are talking about the Pokemon Tower, then first, you need the Silph Scope, which you can obtain by beating Giovanni in the Rocket Hideout at Celadon City, in the Game Corner.
in the vedirian gym
Beat Giovanni at viridian city's gym.
Defeat Giovanni In The Sliph Co. And It Is Gonna Be Unlocked.
Defeat Giovanni in Celadon Game Corner and he will give you it.
Its in Viridian City, the Earth Badge, vs. Giovanni
Giovanni is the leader of team rocket and the 8th gym leader in fire red and leaf green.
he is in the Pokemon tower you have to beat Giovanni in the arcade in ceadon city then you get the sliph scope to look a ghosts
Viridian City, Giovanni(Team Rocket Leader) is the Gym leader.
His name is silver. Giovanni's son
After beating Giovanni at silph co and the game corner he will be at viridian city you need to go there with high level Pokemon to beat Giovanni one more time for the badge.
After defeating Giovanni at his Rocket Headquarters in Celadon City he should give it to you.
IN SILTH CO: at top floor IN GAMBLING BASEMENT: at bottem floor IN VIRIDIAN GYM: at end of hallway