1- In Alpha Saphire, but it's the same in XYORAS
2- I want to say yes, but you have to edit each caracter file (overworld, with the suit, with the costume, battle model, flying model, etc..) and the game will still say you're a boy, only your apparence changes. So, I don't want to says yes, but you can do it. The best methode is my editing your save, but I dont know if it's possible with HANS
3- All of my pics are with boobs boosted
Yes you can, in Ohana3DS just export the top part of your character in *.obj and edit it in a 3D software like Blender. Then export it to *.obj and just import it and save