you need to be in a dark spot.
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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
You can't catch wild Treeko in Pokemon Emerald. You need to choose it out of the three Starter Pokemon that are offered to you at the beginning of the game: Treeko, Torchic, and Mudkip. to see it, battle rival or other trainer
look for a big patch of dark water around route 126 or 127 you should see an underwater cave with the submarine go up by pressing B and continue your adventure
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Go to Route 128 and find some dark spots in the water. From there, use Dive. It should look like underwater canyons that stretch out for awhile. Explore around until you find a cave entrance. Once in, you should see a stolen submarine. Use dive there again to surface. Good luck