I can only help with the first part of your question.

Provided by gamefaqs.

To get her Full Throttle, go to Macalania in Chapter 1 or 2. In Chapter 1, go to the area of the forest with an X shaped cross on the map. Go through to the NE road, and you SHOULD be in the area that reads - Macalania Spring. Find Tromell (Guado) and talk to him 4 times. He'll give it to you.

If you do it in the 2nd Chapter, go to the same area as above, but to find Bayra, the bird with the harp. Talk to him and complete the mission - Track Down the Troupe. After you're done, it will ask if you want to go aboard the Celsius. Answer whatever. If no, Tromell will pop out. Talk to him 4 times and he will give it to you.