You don't, they're Diamond/Pearl/Platinum only.
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To get both leafeon and glaceon in Pokemon soul silver or heart gold you have to trade it from diamond pearl or platinum.
While Glaceon ups Leafeon in battle by type advantage, according to their stats, Leafeon is much stronger. It's also above Glaceon in the battle tiers used for official competitions.
There are eight. Vaporeon, Leafeon, Flareon, Jolteon, Umbreon, Espeon, Glaceon, and Sylveon
To get leafeon, you level up eevee near the green rock in the eternia forest. To get glaceon you level up eevee near the rock on route 217 near snowpoint city.
No, Leafeon an Glaceon DO NOT EXIST on GBA Pokemon games. No amount of cheating with AR/GS will get you these Pokemon on GBA.