Pixelmon Mod

For people who play singleplayer, they don't have access to any ways to trade evo their pokemon, such as kadabra and haunter. I suggest a possible npc that could spawn in villages, and would take trade evo pokemon and evolve it for you, but for a cost. The cost could be modified like how move tutors are, and possibly could as well limit what kind of pokemon could be trade evolved to that npc, (for example, it could allow kadabra to be trade evolved, but not haunter).

The Pixelmon Extras sidemod adds the "/tradesim" command, which allows you to trigger a trade evolution without trading.
But I do like this idea as an alternative without having to rely on cheats.

I would also like something like this. I don't like having to cheat to accomplish the goal to finish the pokedex in single player. this helps streamline things alot and can give a clear cost to evolving this way.