this is a godly healer if you're looking for one. it's easy to get one (Augusta Tower) and it's easy to max it out. it's Feral Link ability heals the party instanly. it ended up nearly 4000 hp for me too. do some fusion and add some good passive abilities. this thing is a beast.
I recommend Flanitor as healer for your first attempt at final boss. combine it with a good SYN and you can 5 star it easily. Green Chocobo is harder to get and takes longer time to be as good as flanitor. Flanitor's Feral Link is better too.