But we're also talking about the chance that it is male, shiny, has enough IV in the right stats to get the specific characteristic and nature, and has the specific height of 3'7" and whatever weight that adds.
I'm not sure about any exact numbers.
But Silver's IV Characteristic could be "Often lost in thought" which has highest Special Attack since 2 of Silver's moves are Specials
Silver is normal height and weight... The bands and TM's (which he can't have normally...) wouldn't even add a lot to that... (Remember that they are made from lightweight materials... The bands from leaves and such, and the TM's from... IDEK what...)
TMs are basically like DvDs so thin metal and plastic or something I guess. You really thought of everything though, I might try doing this with Colt, but I have no idea how to do the equations. :p
So, a normal Jolteon is 0.8 meters (or 2 feet 7 inches.)
And it's weight is 24.5 kilograms (or 54 pounds.)
Colt is a shiny variant, and also slightly larger than most Jolteons, about 3 feet 7 inches.
I don't have a canon weight for him, but you might be able to use height to find weight idk.
Gender: Male
Nature: Naive
Characteristic: Mischievous