Corsola hold Red Shards, and you have a 5% chance of getting one with a Corsola, however, a Fire Stone isn't required to get a Camerupt, Numel evolves into Camerupt at level 33 without the need for a Fire Stone.
Corsola, Red Shard (5%) > Fire Stone
Clamperl, Blue Shard (5%) > Water Stone
Relicanth, Green Shard (5%) > Leaf Stone
Chinchou, Yellow Shard (5%) > Thunder Stone
http://www.gamefaqs.com/gba/921905-pokemon-emerald-version/answers?qid=37039
You have to look underwater using the HM Dive. In some places, there's small rocks that hold a hidden shard. Once you find a shard, trade it to the hunter guy for a stone.
Route 124; Exchange the Red Shard to the Diving Treasure Hunter / Fiery Path; After getting strength
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You can find a Fire Stone in the Fiery Path after you get the HM for Strength.
find one in the firey path or trade 1 red shard for one at the hunter's house
u gotta find a red shard & give it to Hunter to the left of mossdeep city. He lives on an island with one house on it.
With a Firestone you can evolve into a Eevee into a Flareon, A Vulpix into a Ninetails and a Growlithe into a Artacaine
Pokemon such as eevee, growlithe, and vulpix.
a vulpix will evolve with that stone
vulpix evolves with a firestone into ninetails. vulpix can be found at Mt. pyre
in the fiery cave. next to the tram
You can find a Fire Stone in the Fiery Path after you get the HM for Strength.
You can get it at fiery path but you must have strength(TM04).It is right next to the cable car.
find one in the firey path or trade 1 red shard for one at the hunter's house
No one
Vulpix evolves into Ninetales. This is the only Pokemon caught in Emerald that can evolve from a firestone. If you have traded an Eevee or a Growlithe to your Emerald game, they can evolve too.
u gotta find a red shard & give it to Hunter to the left of mossdeep city. He lives on an island with one house on it.
Vulpix.
an eevee
There is a person on an island just above Mossdeep who will trade colored shards for evolution stones. (red-firestone, yellow-thunderstone, ect)