Hello,
I chased a Bagon, i have seen one, used Surf on him with my Piplup, critical hit and damaged him for 60% for his HP, OK
It was not a good Bagon and I chased another, got another, used surf
PAF, super effective and one shoted him
I did not missclick and have no Ice type move on my Piplup
This time, i think the ability TORRENT was active, maybe it activated the bug ?
Sorry for my bad english