So it turns out the event pokemon and event items would transfer over, but he said he couldn’t get the mystery gift items to transfer over (i.e., mask/kimono in Arceus, Sports Rutsack Preorder bonus, dynamax crystal events). He even tried doing thinks like equipping the rutsack or kimono on the switch with the forged BCAT, saving, and then transferring the saves back to my switch. But they would just be gone at that point. Anyone else ever run into issues like this?