I did some math, I might be a bit off so take this with a grain of salt but:
According to the pokedex in Hypno’s Lullaby, and according to the manga:
Gold is 5’6” and 114 pounds (with all his limbs)
Ignoring that that would make him underweight, that means
Since approximately 5.3% of body weight is 1 arm
And approximately 17.5% of body weight is one leg
And 1 eye weighs approximately 0.06 pounds
Blake weighs around 87.9 pounds
And Lost Silver weighs around 61.9 pounds