I understand how this tutorial isn't needed, but there are so many new pipol that still kept on asking how to patch... =/
Anyway... No fancy things here. I'm going straight to the point.
Hacks/Mods have different patches available. If the patch is .ips, then you'll need Lunar IPS Patcher. If the patch is .ups, then you'll need the UPS Patcher. If the patch download is in .rar, and you can't open or extract it, then download and install WinRAR.
Lunar IPS Steps
Double click the smily red moon thingy.
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Click "Apply IPS Patch".
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Select the hack's patch.
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Select your ROM.
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Done! You can now and play the game!
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UPS Steps
Select the proper folder, depending on your operating system.