Smurfing is legit ?

HEllo everyone !

A player did not allow me to have the answer to my question. If you want more details I invite you to add me on the game. Because my question is not valid to the interests of the game. We will be able to speak more freely in private message thanks. Its risky here maybe...

Can the smurf be punishable?

I am diamand and I want to play bronze with a friend. Do I expose myself to risk of banishment? Can play with the people we want in this game even if the level is different.

Do I have to have a second account to play or can I go back to bronze with my own account during the S8 and reset the elo.