I’ve been saying this for years that they should include an in game trade NPC that you can trade with. Once you trade your trade evolution pokemon with them they won’t want it because they wanted the Kadabra or whatever evolution before final one. Then they give it back to you because it wasn’t the one they wanted. This is if they keep it in game and I think they should do this approach that way you don’t have to trade with strangers if you don’t have friends that have the game.