Upstream is a move used by Alisa Bosconovitch since her debut in Tekken 6: Bloodline Rebellion. In this move, Alisa launches her target in the air with the strength and power of her leg.
In Tekken Tag Tournament 2, the attack is tag bufferable. In Tekken 7 Season 3, the attack can also be performed during Destructive Form as part of Dual Boot.