Son Goten
  Being the youngest son of Gokou, Goten was one of the youngest Super Saiyajins. He helped defeat Brolly by doing a triple kamehameha with his father and brother. He does the fusion technique with Trunks in the Fusion Saga, they create Gotenks. When they are Super Saiyajin they become Super Saiyajin Gotenks. When their kis are at ultimate strength they make Super Saiyajin 3 Gotenks. Goten would have to be the 2nd Strongest young saiyajin.