Thanks! I did asked that because yes, you can add 100 EV to a single stat with a vitamin but only because vitamins work until you reach 100 EV on that stat

If you have 0 EV on a single stat, for example, Atk, you can add 10 protein and it will work.

But if you have, based on my situation, 56 and want to add 100 with protein, you can't because the cap is 100. I tried and it only allowed 5 proteins (50) but since there's the 100 cap, I was confused if I had 100-106.

Even though you gave me the answer, which I thank you a lot. I'll try and raise the other 2 stats I was thinking on my pineco, Impish nature "more Defence and less Sp.Atk", Highly Curious (More Sp.Atk... *sigh*) (future forrestress, of course, with Toxic Spike/Spike/Stealth Rock/Explosion):

-200 speed EV

-154 SP.Def EV

Then I'll try and kill 50 pokemons for the rest of the EV's left on my pineco. Then I'll see if the 510 EV cap was reached. If not, then it means it had 100 atk EV. If I did reach, it DOES mean I had 106 atk EV all along.

When I find out, I'll post here, if your curious :P

It may help a few people that did this stupid mistake, like me. (It's my first poke I tried to EV)

Thank you (3rd time I thank) and see you soon with answers =)