>>12190998And in Yellow there is a guy that will trade you a machoke that evolves into a machamp.
I thought the explanation in game was that when they are warped through the machine and reconstituted, it messes them up when it puts them back together. Thus they come out "evolved".
Same thing goes for ones that have to hold an item and be traded. Onyx and the Steel Coat for instance, the machine mixes the two together and they come out as a horrible abomination of the two.