Golduck does not learn Surf by levelling up. You must teach it Surf by using the HM.
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Level 50
It doesn't learn it at a level because it's a tm but it can be teached surf at any level
Slowpoke does not learn Surf by levelling up, but it can learn Surf via HM in all generations.
You can't Golduck but you can get a Psyduck go in the safari zone and find the water toward the left use surf and move around the lake until Psyduck appears capture it train it to level 33 and now you have a Golduck.
you have to teach it the hm surf i believe.............