Part 4 Chapter 3.
I would have to say III
You can't. There are no cheats in Fire Emblem Radiant Dawn.
You get her automatically if she survives the chapter she betrays Begnion.
No, Radiant Dawn is only for the Wii.
You can get that staff by standing on a certain square in chapter 3-13
Part 4, Chapter 3, Distortions. Baselard is at 12E and 10N.
You meet him at the end of Part 2, after Elincia's Gambit, in a cut scene
in a store...
Yes, there are.
No she died in Fire Emblem Path of Radience
About 20
Oliver