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shiny pokemon comes out randomly. there are no set places for it, or anyway to get one. The only guranteed way to get one is a gameshark. If you dont' want to use the gameshark, just play often, battle the wild pokemon more often.
Heracross in both versions are found in the safari zone. (but i don't remember which bike you need... can anyone look into that?)
Wailmer is everywhere... use the super rod and fish with it, and very likely it'll be a wailmer.
super rod can be found in Mossdeep city i believe... (darn it haven't played RS for so long now...) Mossdeep is the island city with the 7th gym on it.
if it's not in mossdeep then it'll be in Lilycove... but it's rather unlikely for it to be in lilycove.
check www.gamefaqs.com and look up Pokemon Ruby/Sapphire. I'm sure at least one of those numerous faqs/walkthroughs up there can help you.