Golden_Latias
#SlayQueenSlay
I think Rockruff gets curbstomoed here and evolves into Midday Lycanroc at some point becore Ash's Grand Trial with Olivia. Olivia still has Midnight Lycanroc, and while battling her, Ash figures out a strategy to beat Midnight Lycanroc, possibly using Midday's speed to its advantage similar to how Pikachu beat Lt. Surge's Raichu.