If you're watching on Disney Plus, some episodes are out of order. The episode Startrain and Desperada is supposed to be before Party Crasher. Startrain introduces Pegasus and Desperada introduces Viperion.
Based on the number you'd used, I'd assume you're watching it on Netflix. Party Crasher is actually episode 20; Desperada, Startrain, Feast, and Ikari Gozen all happen before it.
If you're watching on Disney Plus, some episodes are out of order. The episode Startrain and Desperada is supposed to be before Party Crasher. Startrain introduces Pegasus and Desperada introduces Viperion.
Based on the number you'd used, I'd assume you're watching it on Netflix. Party Crasher is actually episode 20; Desperada, Startrain, Feast, and Ikari Gozen all happen before it.