After finishing the tournament, face the Rubberobos. It takes skill and practice to defeat them, especially Seaslug. However, with the missile head, shoot accurately and it will be a one-hit kill. After defeating the Rubberobos, open your tournament prize for Arcbeetle, the Medabot Space Fighter X uses. The Prominence (head part attack) is only valid twice per battle. Although limited in number, it makes up in power.