You need to get all 16 badges and defeat red at the top of mt. silver. Then professor oak will call you.
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go to prof. oak for a kanto starter
To get a starter from him you have to beat red at mt silver.
Beat all the 16 Gyms, then beat Red at the top of Mount Silver. After that you can receive a Kanto and a Hoenn starter of your choice. The Kanto starter you get from Prof. Oak, but you want a Mudkip I can see. So you must go to Silph. Co. in Saffron City where you will find Steven. He will ask you a question where you may answer Green, Red or Blue. Since you want a Mudkip, you must answer ... Blue of course. Hope this helps you out
it is in pallet town. it is the building with 4 circle windows.
To get into Cerulean Cave you have to get all 16 badges in Kanto & Johto, beat Red in mt Silver, then talk to Prof. Oak