No problem, just put on the Ev raising item of your choice and you should get more of that Ev, but still get some of the other.
Edit: I ev trainer my houndoom there here is its stats and how it turned out so far
Houndoom Mild Nature Lvl 28
Hp:80
Attack:59
Defense:34
Sp.Attack:85
Sp.Defense:52
Speed:77
Oh btw i did do some speed training till i hit lvl 15 then i Sp. Attack ev trainer with Unoun