Board Thread:Admin Noticeboard/@comment-4820209-20181210200123/@comment-33063641-20181215081751

My personal theory is that Godzilla and his kind battled King Ghidorah. The end result was Godzilla's species brought to near extinction and Godzilla having some sort of major injury that dampened his powers.

Probably in the near climax of King of the Monsters, Godzilla gets back his full strength.