i have a question can i use emulators?

DS version isn't something that is that accessible nowadays so I am fine with emulators. I need to make more concrete rules about them though.

i have an original copy but i dont have anything to film it

the screen i mean.

can i use a xbox one controller to move the character and fights and use the mouse for screen stuff?

Yeah that's fine. Input method shouldn't really change anything relevant.