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>catch Haunter
>trade Haunter for Haunter
wtf it's piss easy for mons like Gengar and Machamp in the gts games
but yeah mons like Slowking and Porygon are harder but I still got them you just have to offer kewl mons like Salamence
if you're talking about older games then yeah but whatever the idea behind those games was collecting and sharing with each other it still is but it's easier with the gts