Quoted By:
I would eliminate the entire "evolution-by-trade" mechanic, it never made sense to me.
>Haunter, Kadabra, Machoke...........evolve by level-up.
>Onix, Magmar, Dusclops............evolve when they level-up while holding their item, with a high friendship.
>Karrablast and Shelmet evolve when they level-up, with a high friendship while they are both in your party.