Flier Emblem Advice

That's a good IV, I would recommend LnD in the long run and Darting Blow as a budget Swift Sparrow. With Speed Seal and LnD, you can hit 46 speed with Hone, which is enough. You will want Ardent with LnD though.

As for Palla, I think +Def will help her the most, but +Res will allow her to tank green mages a bit better, which is probably your team's biggest weakness.