Volcanion Questline - Volcanion disappeared after interacting

[Pharaomage]

Good afternoon,

(I think this issue had been reported recently, although unofficially. So, I thought it might be better to make a post to ensure it won't be forgotten.)

 

Last year, I tried finishing the Volcanion questline, only to have Volcanion disappear on me when I interacted with it.

I suspect that it disappeared as I might had a Staffmon Volcanion in my party after beating Crank.

Now, all that remains is an empty Temple Shrine:

 

If you could make Volcanion appear again so I can have the opportunity to catch it, that'd be greatly appreciated. 

 

With kind regards,

 

- Mage