Board Thread:Smashpedia Business/@comment-24529455-20140926150441/@comment-25161957-20141001062056

I'm surprised you didn't know. Well when you play Smash Run and stuff, you will occassionally find these bags with a wrench on them. Those a custom move bags.

I don't know how they work, but judging from the screens of "items obtained", I believe one bag will give one part.

I have also heard that getting all the custom moves will take a ridiculous amount of time so I think it would be better to just start collecting them the moment you start playing the game, or just don't use custom parts.