need help recalling anime series!

No.12428757 ViewReplyOriginalReport
okay i remember watching this anime series about 10 years ago.
it started with a kid having a little robot toy he played with, and when he woke up one day, the robot became big and real.
then he met two other friends, one fat guy with a red robot using a spear, and one girl with a blue? robot who could fly really fast.
usually after every episode the main character would finish off the bad guy with a golden sword that would chop straight down the screen.
what's the name of this anime? it's killing me