Board Thread:Questions and Answers/@comment-7769046-20130403181311/@comment-5945589-20130406153507

Yup. Max level for any skill is lvl20. Wanna try my Lady Suzuka's lvl20 Miracle Cure? ;p

For Kiri, you could even get Kotetsu or Barbetta and try to level his skill up if you can't get the stones. ;)