What bear said.
Also, the 2 other souls you can use PF reliably with on EX skill is with:
1. Arthur, cause skill 1 just gives you max burst instantly
2. Hercules, only with (insert element here ) Axe Neme Askal aka her assault axe, which gives +30 burst on skill 2 so you can burst the next turn if you get a double attack, or 2 turns later while the PF buff is still active.