The existence of trade evolutions not only contradicts the very idea of the inseparable bond between pokemon and its trainer, but also makes no fucking sense logically. How can there be wild Machamps, Gengars, Milotics, etc., roaming around without the interference of mankind? These pokemon had to have existed before the concept of pokeballs, so how can pokemon like Machoke evolve on their own? How does just switching pokeballs with other trainers give these pokemon the power to evolve?