How do you evolve Pokemon in Mystery Dungeon games if they have to be traded?

Question

Like haunter, onix and so on

Answer 1

By getting the item Link Cable and taking them to the spring to evolve.

Comments

Thank you for answering ..... but what is a Link Cable and where do i get it ?

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http://pokemondb.net/pokebase/17499/where-can-i-find-a-link-cable-in-pokemon-mystery-dungeon-time