Valefor.Caivian said:
Since you have the physical stats at 8, go do free runs (races) and build up a ton of chocobucks. With the chocotrains, you can raise a stat slightly without lowering any others.
If i remember right it takes 7 or something just to raise a stat one level.
Pretty much this ^^
When you get 8/8 physical stats, you can use speed apples and do the free runs. It's kinda slow to start, but you'll notice that as you build up discernment with training tokens, you'll start placing first more often
and Caivian is right that you need 7 chocotrains for 1 stat increase ^^. When you go to spend your chocobucks though, don't worry about getting the tokens unless you're using them for a different chocobo. If your chocobo is still in the stables, it's much more cost-effective to put them in a training session instead of buying the token for said session. (It makes a lot more sense when looking at the menu @_e/ haha)
Hope this helps and you guys have a wonderful day~