So, as there's not yet PvP on doubles teams, is there any way to try out doubles partners? I don't wanna level them up until level 100 to use them against gym leaders.
There is one monthly official tournament per month, most of the time with unviable price and sometimes not even shiny. If it happens to be in a good time for you and get in, that should be more than enough for practice(and by practice I mean lose to rng on 1st round and wait another month)