Board Thread:Questions and Answers/@comment-34668827-20170417171153

I used a common candy on my lv100 mewtwo to lower its level to 99. Then, I used a EV booster and fought Iso_Speed 6 times, but the Speed EV didn't change. When I fought Iso_Speed I spammed shadow ball to ko the jumpluffs. What am I doing wrong?! 