I do not know when "Scan" becomes available or if it is but you had missed the spell, but there is another round-about way to determine if the enemy is weak enough to eat. It involves some guessing but it is not too difficult; keep track of the amount of damage it takes to defeat a monster. When you get an idea of how much it takes for defeat you can determine how to get the enemy's low enough. If the enemy is still too strong use weak attacks - like Dagger's physical or Vivi's physical - to lower the health a tad more till it is weakened. Now "Scan" is useful because I believe it does say if the monster has a Blue Magic spell. That problem could be solved by looking that up at GameFAQs otherwise you would have to eat every enemy at least once which is more work than needed but w/o a guide that would be how a player would have to acquire Quina's blue magic.
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