After speaking with Oscuritaforze on this matter, we definitely think there should be at least some kind of policy with pages for characters' custom movesets. There have been a lot of pages created for these, and most of them are stubs. So here's a guideline on what should become a page and what shouldn't.
Attacks that are just like the original, just with different properties, should not have their own page. I'm talking about things like Fast Fireball and Fire Orb, which respectively are just smaller and bigger versions of the Fireball. There's no point in having their own page, which would most likely become a stub. Rather, they should be a Heading 2 section in the Fireball page.
Attacks that are drastically different than the original, like Beat or basically anything of Mega Man's, can have their own page.
Sound like a plan?