We are trying to make an elevator for our robot and have been having some problems with the belt as well as just some general confusion, and with a limited time frame we need to figure out if we need a double sided belt or not.
I suppose depending on the type of elevator or pulley system you were using, you might want a double-sided belt, but in general I’m pretty sure most teams only use single-sided belts, or different methods entirely (cables, chains, etc).
If we knew more about the type of elevator your trying to build (or had an example) we might be able to help more.
Thanks so much our robot is kinda still developing so i don’t have a super great grasp at what’s going on but that helped clear things up a lot, thanks! 
Generally you would use a double sided belt in a place where you need counter rotating wheels, but you don’t want to use gears to flip the direction. This makes the most sense on an intake (see 3255’s off season robot).
That being said, the application for elevators is pretty minimal. Unless your design specifically calls for double sided belts, then you don’t need them.
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Or a shooter, I saw a lot of double sided belting on shooters this year.
I am not sure why one would need to use them on an elevator, unless they are maybe trying to do something like this, to maybe raise and lower the elevator while turning a motor one direction but I still don’t really see the utility in that either.
stick with single-sided for elevator imo, keep it simple. there are other options besides belts like cables and chains that I personally like better. Double sided for shooters usually as mentioned before, we’ve experimented with it on our shooters for flywheels for the CRESCENDO note and its worked pretty well.