Dewgong is stronger as it's both a water and ice type Pokémon.
The Pokemon that can learn Ice-type moves in Pokemon Ruby would include Swampert, Tentacruel, Golduck, Seel, Dewgong, Cloyster, Vaporeon, Octillery, Suicune, Sealeo, Walrein, Jynx, Articuno, Swinub, Glalie, Laapras, Kyogre, Hitmonchan and Medicham.
Dewgong is a fine Pokemon, but is far from Legandary my friend. You can't compare it to Pokemon like e.g. Mewtwo, Lugia or Groudon.
golduck
Nidoqueen, Nidoking, Psyduck/Golduck, Meowth/Persian, Mankey/Primeape, Slowpoke/Slowbro, Seel/Dewgong, Rhydon, Snorlax, Mew, Hoppip and skitty
No
Golduck is a pure Water-type Pokemon.
Dewgong doesn't evolve. - Pokemon Guru
no golduck does not evolve in any Pokemon game
Dewgong evolves from seel
Golduck doesn't evolve.
Golduck does not evolve.
Golduck evolves from Psyduck at level 25.
The Pokemon that can learn Ice-type moves in Pokemon Ruby would include Swampert, Tentacruel, Golduck, Seel, Dewgong, Cloyster, Vaporeon, Octillery, Suicune, Sealeo, Walrein, Jynx, Articuno, Swinub, Glalie, Laapras, Kyogre, Hitmonchan and Medicham.
No Pokemon learns it by itself, but if you have the HM these Pokemon can be taught to use that HM, Gyarados, Seaking (Goldeen), Seadra (Horsea), Dragonair (Dratini, Dragonair), Poliwhirl (Poliwrath), Golduck (Psyduck), Staryu (Starmie), Chinchou (Lanturn), Seel (Dewgong), Mantine and Qwilfish. Hope this helps!
you can only find Seel i believe... then you can evolve it to a dewgong, I highly doubt you can find a wild dewgong =/
No.
Dewgong is a fine Pokemon, but is far from Legandary my friend. You can't compare it to Pokemon like e.g. Mewtwo, Lugia or Groudon.