You unlock this fight in the Octo Expansion by completing the main story and passing all 80 of the challenges in the Subway, or just get all 80 of the Mem Cakes. Inner Agent 3 is the true final boss of the Octo Expansion DLC; defeating this foe is a challenge in itself. If you liked this video, please like this video and subscribe to my channel where I play games such as Splatoon 2 with new videos every other day and at least one or two streams every week with viewers.
No copyright Intended!
All of my gaming content is recorded using an Elgato HD60, and Streamed using OBS
At present, Sub Space King has 115,147 views spread across 321 videos for Splatoon 2, with His channel uploaded over 30 days worth of Splatoon 2 videos. This is 41.39% of the total watchable video on Sub Space King's YouTube channel.