so zar was showing me this really weird video about a special event you can trigger in the ruins of alph with arceus that allows you to get giratina.

giratina's origin forme looks really fat
so zar called it fattyworm

fattyworm forme

Radic is a mushroom: fattyworm giratina is happy to see you, and would be happy to take that cupcake off your hands

you can watch the special event video here if you like.