PokéBase - Pokémon Q&A
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Using using Island Scan on a Wednesday on Melemele Island.
http://www.serebii.net/sunmoon/dailyevent.shtml

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You cannot. You must wait for the pokebank update and transfer.

Sources: http://pokemondb.net/pokedex/horsea
http://pokemondb.net/pokedex/seadra
http://pokemondb.net/pokedex/kingdra

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