I haven't decided how I'm going to handle trade evolutions yet. I might change the method of evolution, or might set up NPCs that will do trade evolutions with you: trade a Kadabra for a Kadabra, for example. The problem with that is the Alakazam you get from that trade won't be yours--bad news if you want to stay the OT of your Pokémon, or don't want the experience bonus, or haven't gotten the "badge"/promotion that will let you control that Pokémon yet...
The best idea (and what I'm going to try to do if I find a way for it to work) is to set up an experimental Rocket forced-evolution machine. They were experimenting with forced evolution in Johto, which is why a bunch of Magikarp started evolving into Gyarados in the Lake of Rage, so it would be plausible for them to have some machine set up in Mahogany Town that would trigger the evolutions of trade-evolution Pokémon without actually having to trade them. That's what I'd REALLY like to do, but don't know how yet. I'm assuming the part of the script that controls evolution-by-trading is buried somewhere deep inside the mess of coding that controls trading in general, so it may not be possible to make a script that can trigger a trade evolution without a trade--or, if it IS possible, unless someone else has located that script already, it's almost definitely beyond my current abilities to find it myself.
Failing that, though, one of the above two options--changing the method of evolution or adding in-game trades--is what I'm going to go with.
