IF YOU DON'T WANT TO SPEND 2 MINUTES FOR LITERALLY NOTHING, PLEASE READ THE BOLD PARTS
So, I did some research, since these kind of questions are the only ones I can answer. Lol
First of all, let's see what Miltank is based of off.
> Miltank is based on dairy cows. It shares some traits mainly with Jersey cattle and Holstein Friesian cattle.
Source
Alright, alright. What is the average weight of Holstein and a Jersey cow are.
> Holstein = 1,500 lbs. (roughly 680,4 kilograms)
Jersey = 1,000 lbs. (roughly 453,6 kilograms)
Source
Now we have to get the average of the weight.
1,500 lbs. (680,4 kg.) + 1,000 (453,6 kg.) lbs. = 2,500 lbs. (1134 kg.)|2,500 lbs (1134 kg). : 2 = 1,250 lbs. (562 kg.)
Miltank only frickenn weighs 166.4 lbs. (75.5 kg.)
But, you can compare a whales weight to a frogs weight. So let's get to Holstein Friesian cattle's length. And sorry that I don't know the Jersey cattle's length. I frickenn visited 'bout 15 different links.
Holstein cattle's are very roughly 5 feet (about 1.5 meters).
And Miltank is only 3′11″ (1.2 meters).
Now, that all being said, let's bring up our last point. You won't believe me while saying this: Miltank uses Rollout. Yes, this Pokémon uses this while running, but also to attack. It goes like this: Rolls (for moving), runs, rolls (for using it as an attack). Now, why did you do everything else if you could just say that? just so you know, bodyweight doesn't always translate into speed. Pokémon Speed isn't just speed. It counts as how fast you can react too. And, I'm pretty sure it's hard to do a somersault rapidly without any stops, but, that's why it's round, and it has Thick Fat because cows don't only have length they have length in the like, uh... Other way. Well, if you do that with Miltank it would only be a few inches. Like literally. Also, she has shorter legs.
That's all!
SeeYaLater!