...Godzilla and King Ghidorah got power boosts from Godzilla Earth and Void Ghidorah?
Something like these, perhaps?
https://www.deviantart.com/kaijudude/art/Nova-Godzilla-525200384
https://www.deviantart.com/kaijudude/art/Lord-Ghidorah-524963326
https://www.deviantart.com/avgk04/art/Lord-Ghidorah-The-God-Of-Terror-747804836
https://www.deviantart.com/avgk04/art/The-Hanging-Fate-Of-The-Universe-829703134