Collect all the Mii outfits, and they actually say 'your body is ready'. You know, in reference to what Reggie often says:
Awesome, isn't it?
Source:
http://www.gonintendo.com/s/238964-smash-bros-3ds-collecting-every-custom-outfit-gives-you-a-reggie-related-response

Awesome, isn't it?
Source:
http://www.gonintendo.com/s/238964-smash-bros-3ds-collecting-every-custom-outfit-gives-you-a-reggie-related-response