Go to Ruin Valley on 6 Island - When you get to the grassy portion, head south. Push the rocks near the southern bend to get the Sun Stone.
Read more: http://wiki.answers.com/How_do_you_get_a_sun_stone_in_Pokemon_fire_red_version#ixzz1NgDWNmox
go to Mossdeep, inside the Space Centre talk to all the guys in there, one of them will give you one :3
*Shi ~ you get it from the space center in moosdeep talk to the sailor there and he will give you a sun stone
Well, simple, you have to win first place in the bug catching contest which is held near the park which Alan the schoolboy talked about. And the only way to win it is to have the highest level bug pokemon that you have caught in the park. So I would get more than one pokemon.
NOTE: One strategy is to get one pokemon, let's say its a level 20. And you want to quit catching pokemon cause you think its a high enough level, well it's not. You need to get something with i higher level. How do I know this? Because I did that once and won third place and only got some no good points... -.-'' < Don't make that mistake though!
Left from Mosdeep City are small patches of diving spots. In them you could go to another place and there are items there. There are different coloured shards. Depending on what colour shard you have, you'll get a stone. You'll need a red shard for fire stone. After collecting the shard, go to the house near the diving spots and trade your shard.
you must go to the mosdeep city and go to the "rocket fly"(the biggest building in this city)and tlk to the white shirt man,you will get a sun stone
Sunstones may be held by wild solrock. (Meteor Falls)
that's a lie wild solrocks don't have sunstones
you go to mystical forest after you beat the game and there should be kecleon selling evolution items...
use a sun stone on a gloom
Obtaining bellossom has not changed in FireRed, you still get them by using a Sun Stone on a Gloom.
It should be somewhere around MT Ember.
SUNKErn SUNKErn SUNKErn
Get a gloom and give it a sun stone
use a sun stone
Go into Ruin Valley on 6 island and go down. The item that is protected by the boulders is the sun stone.
Have ruby or emerald or another sapphire trade you a Pokemon holding the sun stone they received or get one from firered or leafgreen.
The sun stone is an item similar to the thunder stone, water stone, fire stone and leaf stone it evolves two pokemon: Gloom and Sunkern.
There is no dawn stone in Firered.
You get it in island six's Ruin Valley. You must use strength to get it.
It evolves gloom into bellosom. Then it also evolves Sunkern into Sunflora.