Torterra can't learn Surf by HM. However, you could teach Turtwig Surf by breeding.
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There is no such Pokemon. Either you get the HM03 and teach it to one of your Pokemon, or you'll be unable to use Surf.
You teach it surf by using the Hidden Machine.
Get the HM Surf then teach it to a pokemon.
teach it the HM surf
you have to teach it the hm surf i believe.............