how to teach surf in pikemon blue?

Answer 1

You need to head to the safari zone in Fushia city and there go to the secret house at the end (just beyond where you get the warrens gold teeth) you'll recieve surf from the man inside. You'll need the fushia city badge in order to use it outisde of battle.

Pokemon you can teach it to: Any of the water types, Nidoking/Nidoqueen, snorlax.

Answer 2

The original gameboy blue? You have to teach it surf by getting a HM (hidden machine). I think you can get the surf HM by going in the safari zone, finding the "secret" hut, and the guy in there will give it to you.