(2) A useless person who rarely moves outside his house, likes to stay in and his head is impenetrable to matters outside his computer.
(3) A "has-been." Used to go around doing physical activities, but now stays immobile and lazy. May one day become fit again.
ex.2 The celebrity is now a Metapod, but hopes to one day be a Butterfree.
ex.3 "You're more useless than the time my Caterpie evolved to a Metapod!"