you have to find the guy that looks for siucune all the time.
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you go to the bridge north of cerulean, beat the foreign team rocket guy then he should tell you where it is
in cerulean city in the gym idiots
Beat misty then go to cerulean cape
You get TM03 (Water Pulse) after beating Misty.
there both based off of the crystal version so you can get RAIKOU and ENTEI but you wont be able to get suicune until you do a few thing in the story like beat misty and obviously go to kanto and it will be near bills house so will misty at night go to serebii.net for more infoon them...