You can't naturally obtain jolteon in emerald. First you would have to get an eevee. Unlike other games an eevee isn't given to you. Trade with a friend to get an eevee or jolteon. Keep in mind you need a thunder stone to evolve eevee
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You can't.
Jolteon does not evolve, but to get a Jolteon you need a thunderstone to evolve an Eevee into Jolteon.
Pikachu+Thunderstone=Raichu Eevee+Thunderstone=Jolteon These are the only 2 pokemon that evolve with the thunderstone in pokemon emerald
You can breed jolteon with a ditto its gender doesn't mater i got 6 evee eggs.
Yup. My Jolteon learned ThunderBolt a long time ago and still knows it.