MintMilkshake

Hello there.I'm planning on hacking my 3DS, but I just need this simple question answered before I proceed: do I need a physical copy of Pokémon SuMo, or can I use a digital one? And another thing, if I install the homebrew on my EUROPEAN 3DS, will I be able to play my AMERICAN Pokémon Sun on it? Thank you so much for the help