Besides that stay away from bonus EXP unless someone is REALLY underleveled or to fill out a character that advances via storyline(Sothe or Michia sp?) to fill them out before their advance. Using BExp to level them up they can only get 3 stats up. Your best bet is to take everybody you care about after each battle and put them at 99 exp so their first anything they'll level up. This will give everybody max stats keep your party nice and strong(especially important if you're playing on Normal or Hard mode.. this game does not pull any punches)
Paragon is nice(very nice) but if you use my method and level characters as evenly as possible the 2 you'll get from Elincias part will be pleanty to get everybody to max.
In answer to the actual question There's about 4 instances of paragon in the game maybe 3 I forget and you don't really need them perse unless you neglect somebody. Also they don't affect BExp
