Hello vileman, cool team.
This is a really solid and unorthodox sand team, I like it, so kudos to you for using it. Anyways, I see some flaws that this team has, and hopefully my rate can help improve it and iron out those aftermentioned flaws. With that said, let's get to the rate. Alright, first up, I would recommend changing your Bronzong's EV spread to one of 252 HP / 84 Atk / 80 Def / 92 SpD over your current spread. Now, while at first glance, this may seem weird, it allows Bronzong to be an effective Mixed Wall, beating most of the offensive threats in OU. Now, staying on Bronzong, I would suggest Earthquake over your current choice of Psychic. Earthquake is to prevent Bronzong from becoming setup fodder for opposing Magnezone, which love to switch-in to him. Up next, I would like suggest a change of your current Latias set to a slightly better one of 252 HP / 4 SpA / 252 Spe. The aftermentioned EV spread allows Latias to be an effective Boosting Tank, while outspeeding some of the threats in OU, which is basically crucial for a setup sweeper. Finally, I would like to suggest running a Life Orb on your Sandslash in place of your current choice of Leftovers. Life Orb helps Sandslash muscle past the premier defensive Pokemon of the OU metagame. Well, that's all I have to say for now. I hope my advice helped. Have fun and good luck in your future endeavours!
~Dr Ciel~ (The doctor is OUT)