Hello Kirara! You have to go through the ship and find three items: The Boombox, the Soup, and the Gun Repellent. When you encounter Pengy Crunch'n without the items, you have to use Tate's skill "Tate Escape"; when you do have all those items, you have to use them in order to defeat Pengy Crunch'n.
Thank you very much! I'll figure it out how to use those items later. By the way, Can I ask again? Jake already in his human form but he hasn't give me his core, is there something I missed?