How to install:
Use Vbfbrowser to inject “mon” folder to your “FFX2_Data.vbf” Located on your Steam folder. 
Example:
C:\Program and files\Steam\steamapps\common\FINAL FANTASY FFX&FFX-2 HD Remaster\data

When you open “FFX2_Data.vbf” with Vbfbrowser, navigate to:
vbf-data\ffx_ps2\ffx2\master\jppc\battle
and use “inject command” to inject extracted “mon” whole folder.
When finish injecting, you are ready to play.