Originally Posted by Webfoot Hero
Seems like a lot of people are having that problem.
You actually get the reward in your inventory, but you have to look to see what it is. It could be CP, an armory item, or the conveted weapon Hot Shot. I got the Ruby Quartz item for armory, after I did a bit of a search after I finished the 5 battles. You should refresh the game to make sure, as well.