u/Zentetsu-Flamez

I am looking into to buy a New 3ds but I have a few questions that I would love to have answered.
Is region free ok if I am planning on playing Pokémon and at times transfer Pokémon over to the Home?
Would playing on a region free limit me in any way compared to a US region 3ds?
Is there any external tool I would need to mod the 3ds? That way I would be prepared when I start.
Are there any tips as a 3ds owner that I should know that could help in my purchase or accessories?