I'll post a few things just to get it straight.
First of all, THIS IS IN NO WAY PERMANENT. I'm launching the codes through smashstack. This means that it will be launched through the stage builder. You won't need homebrew, so if it's a virgin wii, it stays a virgin wii.
The only thing I'm asking for is that you remove your custom stages from your wii either by deleting them, or storing them on an sd card. It's the only way it'll work, unless you have homebrew. It actually requires me to remove the sd card, so you'll need to bring your own sd card for storing replays if you don't have enough memory on your wii. If you have plenty of memory on your wii, good for you.
This only covers the basics for tournaments. Infinate replays, tags in replays, and no random tripping. If everyone's willing to just take care of their custom stages, we can literally have every setup for brawl be a recording setup!
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tl;dr: No homebrew required, this won't permenantly mod your wii, just remove your custom stages from the wii's memory.