You could.
You have to select Battle Start and then it gives you the option of picking from your party or your Battle Box...

Well I'm good to go now. i don't battle much

Good, good.

Why did my partner send out a Ground/Ghost against a Water and a Ghost type?

I didn't have a choice.

*Cries*
Oh well. We still won the first one.

Hey look! Grossberg actually did something! Ahh the days of hi's youth, like scent of fresh lemons, you see?

GG everybody

What? I can't hear you over the sound of Greninja doing all the work :lol

Don't worry. I'll be building my team over the weekend. Just need to figure out who else can be in it

Good game!

And anyone up for a 1 on 1? I'm still hyped :lol