Okay, I edited two codes. They were the Custom CSS (Character Select Screen) and Custom SSS (Stage Select Screen) both made by Spunit262.
The first edit I made was an in-game tier list. I think it's pretty useful in case you ever wanted to refer to the tier list without having to go on your computer.
The second edit I made was an organized stage select. The top 5 stages are all the neutrals. Next 3 rows are counter-picks, last two are banned, and the next page are just the stages that are REALLY banned. (75m, Mario Bros, New Pork, etc.) And the extra stages such as Target Test and what not. (I cannot figure out how to get rid of those, so I just replaced them with the Menu icon from My Music. If I replace them with blanks, the shadow's still appear and you can still select them. If you select them, they freeze the game.)
Here's the video.
Remember, I did not make these codes. They are originally made by Spunik262, I only edited them.