Zilla

Zilla is Pooh Bear's kaiju ally in the Bowser movies. Zilla was the last surviving offspring of the monster mistaken for Godzilla that attacked New York after the battle with the Galactic Empire. He, as well as all of his siblings, were eggs laid inside the Madison Square Garden by the Godzilla imposter. Unlike his siblings, Zilla survived the bombing of the Madison Square Garden and was later found by Mewtwo, who kept him w/ permission from the military, while his father was transformed into Cyber-Godzilla by Bowser.

Trivia

 * Zilla's origin will be revealed in Pooh's Adventures of Godzilla.
 * Mewtwo called him Zilla so no one will confuse him w/ his Japanese counterpart.
 * Zilla is very different from his father. Unlike his father, who reproduced asexually, Zilla is sterile (or possibly can only reproduce sexually and a mate simply doesn't exist)