I think you can only get it by using a thunderstone on an eevee. You get the eevee from Bill in Cerulean City.
Jolteon can't learn Spark on Pokemon FireRed.
Evolve the Eevee you get given at the top (using the back entrance) of the Pokemon 'Mansion' in Celadon using a Thunderstone.
The Pokémon that evolve via the Thunderstone are Pikachu which evolves into Raichu and Eevee which evolves into Jolteon.
its not a jolteon when u get it. its an eevee. use the thunderstone to make it a jolteon. the eevee is in a house in celadon city
Starters vaporeon eleztibuzz legendary birds hypno dragonite magmar jolteon
135 is Jolteon, an evolution of Eevee. You can't find Jolteon in the wild, you need to evolve your Eevee by using a Thunderstone.
You cant find it in Firered only leafgreen.
Staryu is a water type Pokemon. In Pokemon FireRed, it is possible to find lots of Staryus in the Seafoam Islands.
in the secret citey mcors citey
You cannot find Piloswine in the wild on Pokemon FireRed. You can find it's pre-evolved form Swinub in Icefall Cave on Floe Island in the Sevii Islands of Pokemon FireRed.
Celebi cannot be found in Pokemon FireRed. The only way to get Celebi in Pokemon FireRed is receiving it from an event distribution. These events are sadly no longer supported for Pokemon FireRed.
It's not possible to find Sudowoodo in Pokemon FireRed. You will need to trade for one from a Pokemon Emerald game-save.