[glow=blue]-Moved to Proper Place-[/glow]
Hey there WindedTuna1.
When you see a sun in the top right corner like in the picture you have shown, that means that one of pokemon on the field (in this case the wild vulpix) have the drought ability. You can read more about the drought ability here. Other weather effects such as sand, hail, and rain also have an indicator the top right corner as well. :)
Ah that makes sense. Never would've guessed but now that I realize it's just the ability I feel i should've realized sooner haha. Thanks for the help.