The game plan, usually determines the number of battles needed for the chocobo in the customization screen to reach the treasure.
While in Casual, it's 15 battles, in which you get a chocobo hair (a 30% chance to break accesory with 20% experience gained in battles), normal, it's 30 battles, you get a chocobo feather (30% chance to break, 50% experience gained) and in hardcore it's 60 battles, you gain a chocobo wing(30% chance to break, 100% experience gained).
There are other two chocobo modes that you'll unlock in future gameplay, but i'll leave them to you to discover ;)
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
