How hard is it to get a 4* in all chocobo? I've been trying for a while now got my Pedigree 9 chocobo and i keep breeding it but it just seems i get a tad unlucky xD

Is it absolutely needed or can i just ride along with lets say 3 stars in cunning & accel? Since i'm not planning to max those out?
Honestly i just want the best chocobo i can get to farm MGP with if they ever do bring out more stuff. and kill some time with=P

Any tips are welcome!