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OP is right,
Psyduck/Golduck should have been made Water/Psychic
Just like:
Treeco/grovyle/spetile
>Grass/Dark
Shinks/Luxio/Luxrey
>Electric/Dark
Spoink/Grumpig
>Psychic/dark
AAaand, I know this is off subject but Lovdisc should be able to evolve into Alomomola