There are several different types of shards scattered across the sea in emerald version. i haven't playe dit in awhile, so I forget the exact locations of specific shards. However, you can go catch a bunch of Corsola and they might be holding red shards, or use Thief on them.
Chat with our AI personalities
you can find it on route 124 I've had a vulpix and to make it evolve i had find the red shard and i had to give it to hunter in mossdep city to get the fire stone
to get a red shard in emerald, you have to go to route 124. Hope this helped You have to dive underwater using hm dive and find them hidden in pale couloured stones, such as those you see in caves
find one in the firey path or trade 1 red shard for one at the hunter's house
its near the northwest corner of the route.
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.