i wish i could just merge all the times ive answered this question since its very long lol but im feeling nice so I'll answer it in what detail im willing to provide :P
you can get ONLY 2 in the game (excluding trading)
one is given to you by a sailor in Gateon Port in the Auto Parts Shop. (provided you picked Flareon as your desired Eeveelution)
and one other fire stone in the belly of the S.S. Libra.
*now i advise you to NOT use that fire stone that you get from the sailor because in MY opinion Flareon isn't that great due to poor stats, but also because if you eventually want to evolve a shadow growlithe AND vulpix you get, you will need BOTH stones. it works best if you want a Vaporeon due to finding a water stone in Phenac Colesseum.
though later, after you clear story mode, and by chance HAVEN'T evolved your Eevee, you can trade in a stone bought or found in another game and trade it in as a held item from a Pokemon.
the ss libra
no but you can get one in fire red and leaf green.
No, Pokemon XD Gale of Darkness takes place 10 years after Pokemon Colosseum.
Gligar will not evolve in xd gale of darkness.
Eggs cannot be obtained or given to Pokemon XD Gale of Darkness.
you can get a fire stone in the ss libra in the deep part of the hull.
You find one in the ss libra.
Doesn't exist iron stones are not in Pokemon xd gale of darkness.
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You can't, there is no such thing.
the ss libra
In order to evolve a Shellder in Pokémon XD Gale of Darkness you need to use a Water Stone on it.
No, there is not a breeding center in Pokemon XD, Gale of Darkness.
Yes you can you get it in the beginning of the game at gateon port you have to talk to the shopkeeper in the shop which is on the left side of gateon port
there is no train in gale of darkness
no but you can get one in fire red and leaf green.
No Pokemon Gale of Darkness is a real. It was made for the Gamecube in 2005.