2v2 PZ Help

Hey Guys, 

My friend and I are really nooby at Starcraft but that doesn't stop us from playing 2v2's. We were placed in the Bronze league last season, and haven't played since the new one. I've also been playing more than he has, mostly campaign but some 1v1. I've gotten a loose hold on the FilterSC max roach build. My question is for my Protoss friend. If I am building lots and lots of Roaches off of 2 bases, what should he be doing? My gut says he should go max Stalkers to support my Roaches, but how would he go about that most efficiently?

TL;DR - I play zerg with a toss buddy in 2v2. I build lots of roaches, what should he do?