Has some research done about evolution correlation between the same Pokémon?

But it only has hapenned once and in the case that I´m telling you, you can´t guarantee that Will happen the same to you, In my case was a shame to happen...

I agree its completely random, but I havent seen any data that controlled for it.

The only data that I saw showed that the Moves were all 1/6 chance. but didn't control for the unevolved form.

Because if unevolved are all random moves but have influence on final chances. It will still all be 1/6

Basic example:
Let's say you have a 1/6 chance of Vince Whip + Powerwhip on Bulb. But that combo has a 1/3 chance of becoming Vine Whip Solarbeam. Yet the Tackle/Sludge Bomb one can't become that combo ever. You would still end up with 1/6 evolution for Vinewhip Solar.

That's probably way too complicated to have modified ratios based on original moves. But it's therotically possible.

I haven't seen any studies control for base moves, though I might have missed it.