>Mustard wants you to continue training for "when the time comes", which can't mean his retirement since he wants to continue training as well
>Honey says that Galar is too far away for any Champion to come for a "friendly pickup match" - not in general, just for a friendly battle
>27 unknown Trainer battles exist in what dataminers have gotten of Crown Tundra
Ignore what Honey says as dialogue in line with "The Battle Frontier Project Has Started!" if you want. Assume those new Trainer battles are revised teams of Gym Leaders and rivals for the Galar Star Tournament if you want. If that's the case, then what could Mustard possibly be talking about that involves both him and the player - a former Champion and the current one?