Mt. Coronet cannot be reached in Pokémon Emerald. It is not possible to visit regions outside of the version's main setting. It's especially impossible to visit locations or regions that haven't been created prior to a version's release.
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There is a map of Mt. Coronet in the Sinnoh region.
Mt coronet is only in diamond or pearl or platinum not in firered.
the easiest way to do so is to get a magnemite in emerald and evolve it in emerald and then transfer it to pal park and do a capture show. then level the magneton up in mt. coronet.
Get the national dex and transfer from ruby, sapphire, or emerald or in Mt. Coronet on the snowy area by using the Poke Radar
Spear Pillar is at the top of Mt. Coronet (Sky Pillar, where you catch Rayquaza in Pokemon Ruby, Sapphire, and Emerald, does not appear in Platinum).