Hey! Sorry for the massively delayed response, I don't check here very often.
If you have the right rom, rename it to the exact same name as the ips file (without changing the file extension) and put them in the same folder. Then just open it with VBA. It should work.
As in:
Light Platinum.gba
Light Platinum.ips
Has to be exact.
If that doesn't work, for whatever reason, just find an IPS patcher and actually patch the file.
If you have the right rom, rename it to the exact same name as the ips file (without changing the file extension) and put them in the same folder. Then just open it with VBA. It should work.
As in:
Light Platinum.gba
Light Platinum.ips
Has to be exact.
If that doesn't work, for whatever reason, just find an IPS patcher and actually patch the file.