Originally Posted by
KeiranOlive
What might have happened is that you retired the chocobo at Rating 40 instead of Rank 40. Your rank is your regular leveling. Your rating determines which races you can compete in and is often much higher than your rank. If you talk to the feathertrader at Benchbranch Meadows you can get another chocobo registration. It sucks, but you'll have to just start over.
If you did it correctly and did get the retired chocobo registration then take it to the Race chocobo breeder at Benchbrach meadows.