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How do trade evolutions even work? What counts, in the Pokemon universe, as a successful trade that'd trigger an evolution? How do wild Gengar, Alakazam, Scizor, Dusknoir, etc. exist in the wild? How did they even exist when humanity was unable to efficiently store Pokemon and trade them?
Trade evolutions are fucking dumb, and it's an outdated, pointless gimmick to "encourage people to go outside," just like selling 2 versions of the same game.