You can't find it; it's not like that. If you got the Eevee from Bebe, use a Thunderstone on it and it evolves.
Jolteon
Jolteon.
Pokemon 135 is a Jolteon you must get and evee and put a thunderstone on it!
Sinnoh - 114 - Unown Sinnoh - 135 - Lumineon National - 114 - Tangela National - 135 - Jolteon :)
glaceon /vaporeon/jolteon/umbreon/flareon/leafeonand espeon
There are only two Pokemon(without the National Pokedex).They are Pickachu (into Raichu) and Eevee (into 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 do not find dialga in Pokemon pearl
in the secret citey mcors citey
Jolteon does not evolve, but to get a Jolteon you need a thunderstone to evolve an Eevee into Jolteon.
Trade with Pokemon Pearl or Pokemon Platinum
the best Pokemon you can catch in Pokemon pearl is heatran