My view is that this falls into the same sort of category as lore does.
There's a reasonable limit of what we can help with without expending massive amounts of effort; invincibility codes, unlimited cash, that sort of thing. Even unlocking things already in the game. That's pretty easy memory manipulation.
Asking for AR codes that do extremely specific things that don't relate to these areas, though, such as hacking Waluigi into Super Mario 64, are well outside our expertise. These are far too specific to help the internet at large, and we don't have skills or knowledge to deal with them. This is the same area as lore that's not addressed in canon; we can't be reasonably expected to be able to answer these questions.
It requires a small amount of expertise to determine if what is being requested is possible or not. That's fine. If what the asker wants is to add or change something that's not within the game's assets, that requires us to create that from scratch, or modify something existing to certain specifications, that's off-topic. If it's something that's already in the game, and just needs some poking to make it show up, that's fine.