Platinum Infiniton Drop[]
https://youtu.be/H0H-vDjO7OE?t=14m57s
In this feat, the Platinum Robo grabs Giga-Goojin by the leg and slams it down into the earth.
Right when Wonder Red says "Platinum Infinition Drop", it takes about 2-3 seconds for Platinum Robo to reach the ground with Giga-Goojin. I'll say 2.5.
Giga-Goojin weighs 6,169,400 tons, or 5,596,785,535 kilograms.
I'll assume different heights for different ends.
For 1,000 meters, that would be 400 m/s.
0.5 * (5,596,785,535) * 400^2 = 4.4774284e+14 Joules, or 107 Kilotons - Large Town level.
Assuming 2000 m, that's 800 m/s.
0.5 * (5,596,785,535) * 800^2 = 1.7909714e+15 Joules, or 428 Kilotons - Large Town level
Assuming 4000 m, that's 1600 m/s.
0.5 * (5,596,785,535) * 1600^2 = 7.1638855e+15 Joules, or 1.7 Megatons - Small City level.
Or for the absolute highest end, since we see Giga-Goojin burning up as it falls down, like a meteor, let's assume the speed of a meteor - 11,000 m/s.
0.5 * (5,596,785,535) * 11,000^2 = 3.3860552e+17 Joules, or 81 Megatons - City level+
Giga-Goojin's Self Destruct[]
Try the same video at the 19:39 mark.
There's also the feat after the Giga-Goojin's feat where it self-destructs, creating a massive explosion that the Platinum Robo doesn't even flinch from, and can protect the Wonderful Ones from it just by cupping its hands over them.
So Giga-Goojin's mass is 5,596,785,535,000 grams. If we assume steel for the density, or 8.05 g/cm^3, that makes the volume 695,252,861,491 cubic centimeters.
For pulverization (using 1000 j/cm^3 because the GEATHJERK Federation tends to be pretty high-tech): 1000 * 695,252,861,491 = 6.9525286e+14 Joules, or 166 Kilotons - Large Town level
For vaporization: 25,700 * 695,252,861,491 = 1.7867999e+16 Joules, or 4.3 Megatons - Small City level+.