1. Fight Huangling in the [Floating Palace] in Sky City (appears from 14:00 to 16:00, 18:00 to 21:00 every day, brush it a few times) and you can get the soul adhesive after capturing it.
2. Use the Blue Spirit of Life on the boulder crystal platform in the Pet Garden to generate Life Particles. 50 Life Particles can be exchanged with Louis in the Pet Potential Training Room of the Magic Academy.
The above is the relevant content about how to obtain the soul adhesive in Locke Kingdom. I hope it will be helpful to you!