Most rom hacks come in the form of IPS patches. In order to get the hacked version of a game from this patch you'll need:
The hack patch
The original (unmodified) game file
Lunar IPS, download for Windows: https://www.romhacking.net/utilities/...
Then open Lunar IPS and select “Apply IPS Patch”.
Use file explorer to select your patch and click “Open”.
Then on the next screen select the original unmodified game file to patch onto and click “Open” again.
Your game file should now be patched to the hacked version.
Find more hacks at https://www.romhacking.net/
More projects at: https://notin.tokyo