Pokémon Go's new Trade Evolution mechanic is a cool nod to the main series

Last Friday, Pokémon Go released another menagerie of creatures from the Unova region - those originally found in DS games Pokémon Black and White.

But it also added a new gameplay mechanic - Trade Evolution - which is based on something found in the main games all the way back in Pokémon Red and Blue.

In the main Pokémon series, some creatures can only evolve when traded from one Trainer to another. It's something Pokémon Go has had to work around in the past - as trading was only added to the game later on.

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