User blog comment:12yz12ab/Revealing parody.../@comment-1823154-20100724004350

Pretty much MOTHER 3 continues off the story of MOTHER 2, also known as Earthbound.

As far as I recall, after the fight with Giygas, Porky (originally known as Pokey) travells in time to MOTHER 3's period. The time travelling made him really old and fragile, so he needed to be kept in that spider-mech (you've seen it in Brawl) to stay alive.

I've only played Earthbound, haven't played MOTHER 3. Apparently MOTHER 3 is only available in Japan, but I hear there's an English-translated ROM floating around somewhere.