If the stages came with .rels, you need to use those >.>
That is true, but I'm gonna be nice and deliver an answer along with an explanation.
Stages are designed to work over a specific stage. Merely renaming a stage made for Final Destination to "STGOLDIN.pac" will cause your Wii to freeze. What prevents this is a REL file (which you also cannot just rename), which goes in the "module" folder of "pf".
In some cases a stage will come with its own REL file, but if not or if you just want it to go on a different stage you'll have to port it. To port a stage you'll need:
- Knowledge of what stage the desired hack is built for
- The REL for the stage the desired hack is built for
- "Stage Switcher" program
If you need a REL file check the resources tab at the top; Google is your friend for the program.
Note: Nothing can be ported over Lylat Cruise, it'll freeze no matter what. You can get texture hacks for it but that's all.