How Battra could work in Godzilla

How could the monster Battra, the ying to Mothra's yang, be in the Legendary Godzilla movies? The obious choice is to make a new movie with Battra in it as eithe rthe main villan or a major plot point. I see Battra workng s a way to tie Godzilla and Mothra's friendship/ pack bond/ respect for each other. How? In the Godzilla 2 movie, Mothra most likely will hatch as a larva during the movie. What if Battra is an egg that was put into the same nest as the Mothra's and possibly kills one of the babies until Godzilla comes and kills him or injures him?  This way the Mothra(s) would trust Godzilla and follow and help him fight. This may sound stupid but this way Battra gets in a movie and Mothra has a reason to help Godzilla. Also Battra could come back and try, and might succeed, to kill one or more of the Mothras. What do you guys think? Would Battr aneed his own movie or just squeeze him into the 2nd or 3rd movie? Mke sure to read and vote on my Legendary Origins Battra topic!