Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Tiers are locked at the beginning of each round. Please note that Round 1 is going up on July 31st and tier shifts are happening on August 1st. If you want to practice with your teams on the ladder I suggest doing so before Round 1.
It's past August 1st, plus LC doesn't get anything in tier shifts.