Evee will never evolve to leafeon in firered because leafeon wasn't created until diamond, pearl and platinum came out meaning it doesn't exist in firered.
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Eevee has 7 evolutions who are Vaporeon, Flareon, Jolteon, Umbreon, Espeon, Leafeon and Glaceon. To evolve Eevee into the water type Vaporeon, use a Water Stone on it however in order to evolve it into the fire type Flareon you need to use a Fire Stone on it and for the electric type Jolteon use a Thunder stone on it. Eevee will evolve into the dark type Umbreon if it's really happy and if you level it up at night and Eevee will evolve into the Psychic type Espeon if it's really happy and you level it up in the day time. For Leafeon, just level it up near the Moss Rock in Eterna Forest and it'll evolve into the grass type Leafeon and in order for Eevee to evolve into the ice type Glaceon you need to level it up near the Ice Rock which is near Snowpoint City.
In Pokémon HeartGold, you can only evolve Eevee 5 ways which would be: Using a Fire Stone on an Eevee into to evolve it into a Flareon, use a Thunderstone on Eevee in order to evolve it into a Jolteon, use a Water Stone on Eevee in order to evolve it into a Vaporeon, evolve it into Umbreon via level-up at night (which is between 8PM and 4AM) when it's happy enough and evolve it into Espeon via level-up during the day time. You can also evolve Eevee into Glaceon and Leafeon however evolving Eevee into Glaceon or Leafeon is not possible in "HeartGold" or "SoulSilver," Eevee can only evolve into Glaceon via level-up when it's near the Ice Rock which can only be found in the Sinnoh region near Snowpoint City and Eevee can only evolve into Leafeon when it's near the Moss Rock which can only be found in the Sinnoh region which is in the Eterna Forest.
To make Eevee evolve into a Flareon, you have to expose it to a Fire Stone.
Evolutions` Eevee Simple. Eevee does not evolve at a certain level. Eevee+ Fire Stone=Flareon Eevee+ Water Stone=Vaporeon Eevee+ Thunder Stone=Jolteon Eevee+ Level up at maximum happiness in daytime=Espeon Eevee+ Level up at maximum happiness in nightime=Umbreon Eevee+ Level up at mossy rock=Leafeon Eevee+ Level up at ice path=Glaceon Hope I Helped! :D
you cant evolve eevee with a moon stone