Doesn't confusion last for 4 actions instead of 4 rounds?
Anyway, fantastic job Electro, let's get some massive damage in before you faint. With the combination of the stealth rock and what you're about to do (I'm giddy with excitement just typing this), Eevee should be an easy KO for Swamp Thing.
Here we go! Use Thunderwave, then Thunderwave again if he isn't paralyzed, and then use EXPLOSION! Well, use Explosion at the first opportunity that he isn't Detecting, but if he does Detect then just use Thundershock.