Strategy Guide

There isn't a separate flower shop. It's inside the shops. If you buy flowers from within the shops, you'll clear the mission. As for shops dealing with fish, gems, etc., try searching well on the right side of the sea. You'll find them there. Also, for fishing, you can catch fish by continuously keeping the fish within the moving green mark of the reel. And for diamonds, if you consistently watch ads, you can get 5 diamonds and buy a fairy egg. Depending on your luck, you might even get an S-rank monster, the highest tier.