Pokemon And Boobs Pokemon Question: Do EV Points Start Accumulating From The Very First Battle After You Capture A Pokemon?

Pokemon question: Do EV points start accumulating from the very first battle after you capture a pokemon? - pokemon and boobs

I have a lvl. 3 Pokemon, and I wondered if they start to get the values of effort after the first fight. For example, if I get a battle Bidoof, as always, a health-EV, but had never met, or that his statistics are to a certain point before I start EVS to accomplish?