The Self Destruct of the black Fog

Take a look at this! 

The black Fog's Belly a swelling up 

and explodes violently by using Self Destruct 

and destroys the Hyper Ball 

and then the Ruins began to collapsed. 

Sabrina was awaken and then 

she saved Ash, Pikachu, and Abra by teleporting 

from the Ruins were collapsing.
Looks like the black Fog wasn't fat at all, 

the black Fog holds its Stomach 

with its Hands before it explodes 

by commiting Suicide.