Why didn't I think of Sea Lion for Chocoboy's riddle? Must have been a bit more interested in getting the cure thing....

Hmm, the new riddle....

Dazzle the Ladies
Dazzle the Lords
Seems to be referring to the begging play, where one needs to impress the nobles to get an item.

Battle with gems
Not with swords
This brings the Alexander summoning thing to mind, unless I'm way off.

4 for 1 and 1 for all
For a shield that's magical
Brings to mind the four elemental magic mirrors that one attains at Ipsen's Castle.

Its shimmering shine
Is quite divine
Brings to mind the Shimmering Isle, unless I'm off course with this one.

Its healing is grand
With more on hand
The healing that occurs with the gemstones one holds.

This entire thing makes me think the answer is an enemy....