During Chapter 8, Budding Bodyguard, you'll be tasked with guiding Aerith through the Sector 5 Slums – away from the church where she cultivates her flowers and into the residential area of the Slums.
Fight a few battles, work your way through the Slums and a lady at Leaf House will ask for your help in decorating the orphanage.
Follow Aerith to her house, watch the cutscene, and you'll receive a flower-gathering basket.
Now, you'll have the choice to pick a series of flowers around the garden.
Depending on which flowers you choose to pick, the kids and staff at Leaf House will make different decorations.
• Two white flowers, one yellow flower: Chocobo Design
Carry on with the main game until you can start doing side quests. Head back to the Leaf House and you'll enter a cutscene. Trophy unlocks after that.