Fat goku is an alternate universe goku who is considerably weaker than normal goku as his only power is his great weight.
Weighing in at pi with the decimal point removed metric tonnes , Fat goku can squash just about anything except himself.
Speed - 1 micrometre per billion years.
lifting strength - class negative 1000.
Striking strength - impossible to measure due to it being so weak.
leaping ability - 1/100th of a cm.
Fat goku met his end when his enormous mass caused him to collapse into a blackhole that was subsequently eaten by Gorilla goku.