Ep 6. Aquario's Challenge

In Beyblade Metal Fusion season 1 episode 6, titled "Aquario's Challenge," Gingka and his friends stay at a hotel where they witness a Beybattle between two strong Bladers, one of them being a girl named Hikaru who owns the Aquario Bey. Gingka recognizes Hikaru as the Blader who saved him from the Dark Nebula organization in the first episode.

Following the battle, Hikaru meets Gingka and his friends and they learn that she is trying to master the Aquario Bey's special move, the Water Shield. Meanwhile, a mysterious Blader named Tsubasa appears and challenges Hikaru to a Beybattle. Tsubasa is revealed to be a member of an organization called the Dark Nebula, the same organization Gingka fought against in the first episode.

Tsubasa uses his Beyblade, the Eagle, to battle against Hikaru's Aquario. He also uses a unique style of Beyblading that Gingka recognizes as the same style that his father, Ryo Hagane, used. The battle becomes intense as both Bladers showcase their skills and special moves. Tsubasa's Beyblade seems to have the upper hand as it continuously attacks Aquario with its sharp beak.

In the midst of the battle, Hikaru realizes that she can use Aquario's Water Shield to counter Tsubasa's attacks. She eventually uses the shield to block Eagle's final attack, causing Tsubasa to lose the battle. After the battle, Gingka and his friends confront Tsubasa about his involvement with the Dark Nebula organization. Tsubasa admits that he was once a member, but he left the organization when he realized their true intentions.

The episode ends with Tsubasa leaving, but not before telling Gingka to beware of a Blader named Ryuga, who is the leader of the Dark Nebula and the owner of the dangerous Beyblade, L-Drago. Gingka realizes that he must be careful in his future battles as he may encounter this dangerous opponent.

Overall, "Aquario's Challenge" is an exciting episode filled with intense Beyblade battles and the introduction of a new and mysterious character. It also adds to the ongoing plot of Gingka's quest to become the best Blader in the world while facing challenges and dangers along the way.