Did you play 13?
Basically you have two party members, Noel and Serah. They have full sets of paradigms. But then your third party member is used by monsters, who have one paradigm each. When you switch paradigms, you switch monsters depending on your paradigm set up.
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"Don't freeze up girl, you're looking quite a sight." - Adam Ant.
"Baby, can you dig your man? He's a righteous man." - Larry Underwood