No, you don't. All you need is to level it up to level 33.
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Psyduck doesn't evolve with stones. Psyduck evolves into Golduck at level 33.
No stone is needed. Psyduck evolves into Golduck at level 33. Awesome Pokemon btw. :D
Psyduck evolves at level 33.
psyduck evolves to golduck at level 33.
Psyduck evolves into Golduck, starting at level 33.