I dont know myself but im sure if you go onto soul silver walkthrouht it should walk you throught what you dont know in picture form with captions.this really helps.
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In the Cerulean Gym
Cerulean cape is the area north of Cerulean City. It is just north of the bridge that connects the cape to Cerulean City. The cape is any land that is above the Bridge that connects the cape to Cerulean City.
pizza
Cerulean City.
Rock Tunnel. Which is located directly right of Cerulean. You must have a Pokemon that knows 'Flash' however