Suggested by Sonic Gyaos is a strong Kaiju but he has no answer for Apoo’s sound attacks. They were strong and fast enough that even Luffy and Zoro got tagged with them despite having Observation Haki. Gyaos would be taking heavy damage here and won’t be able to get in close. There’s no way for him to out speed the sound vibrations and so this will be the end of his journey. Apoo wins.