Hey Stars, looks like there may still be an issue with Duking's trades. I tried trading a Chansey (Lvl 18, Party Slot 6) for a Quilava, and while Duking doesn't refuse the trade and immediately crash after, he now completes the trade and crashes once the textboxes clear. Shown below is the last successful message from Duking before the game soft-locks, followed by an admittedly useless screenshot of everything being frozen (Different attempts, ignore the different positioning of the models).
I play on Dolphin 5.0-5774 with Dual Core disabled to prevent other crashes. No error messages (Panic Handlers are enabled) appear during the softlock.
Happy Holidays, and Happy New Year!