Boosting but not?

I reasently got to know from a player that there is a way to boost someone up without getting a penalty. This follows with one higher skilled player having a really low elo acount and taking a player duo to boost him up and from what he told me it issues no short of penalty. Is this really a thing? So I could just get a frend of mine from challenger to make a new ac and he duo with me to boost me and no penalty at all? Or is this something that would issue a penalty?
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