I was looking on Google if there is a formula to know which are the EV that has a Pokémon but i only found calculator that needs that values to get the IV, but that's not what I want.
I found the formula to calculate the IV but i would like to know if exists one for EV.
Edit: I edit to add more details.
I asked this question because i was intrigued to know how it works. I was playing Pokémon Red Fire and the idea came to my head. I was looking on Google for my question and i found formulas to calculate the stats, and the stats needs the EV and IV and i thought that maybe exists a formula to calculate the EV.
For example, if i have a Charizard lvl 50 get the EV from his stats, but as i read it's not possible because it needs to know which Pokémon i defeated with Charizard
Best Answer
In Generation 6, go on Super Training and get yourself a reset bag - It's the pure white one. You can get them by continuously tapping the default punching bag on the main Super Training screen.
Once you have a reset bag SAVE YOUR GAME and have your Pokemon punch the reset bag. The bag activates, your EV's are reduced to zero and the amount of EV's lost in each category will pop-up. It will not be there long so make sure to write them down.
Now you can reset your game and your EV's will be back to normal before the reset bag.
This method works on both Pokemon X and Y as well as Pokemon Omega Ruby and Alpha Sapphire.