Skipping/Jumping over Leagues

Hello guys, Have a question about skipping leagues (something like from gold V to gold III). Is this possible in higher leagues and if yes, how? Do you have to win a X amount of ranked games in a row or what? My friend who was Silver V jumped over to Silver III (he was silver at the ending of the season) My current winning streak is 6 won games in a row, got 79 LP Gold IV (at the ending I was gold IV as well but my highest division was gold I (if that can help, idk..) Please don't reply if you have no clue about this at all.. Thank you
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