Fangking told me that trades were possible with RMXP, though if the work was too much, the idea was to have an NPC that evolves Slowpoke to Slowking for you if you gave it Slowpoke with a King's Rock, as well as a Link Cable item. Or an NPC that would trade with you and replicate all the effects of trading. Or a simple Link Cable item that evolves trade Pokemon.

The decision wasn't final.