>it's literally the Legendary Godzilla with a shell.
>really old trailer
>the trailer in OP is from 2016's comic con.
>However, if they fight, Gamera wins.
A lot of that felt like it was just Guardian of the Universe with CGI instead of suits. I'm pretty sure the shot of Gyaos's eye exploding from Gamera's fire is right out of the first movie, and the Gamera design is almost identical.