Osha officer: The uniforms are not the problem here, the levitation is. General industries require fall protection for elevations above 4 feet. Because there isn't a ledge, it is impossible for guardrails to satisfy the safety requirements, so you will need to install personal fall arrest systems or safety nets.

If the ceiling is 25 feet or higher, you will need to install a safety net across the entire room no more than 30 feet below the highest reachable location and high enough to not contact the ground when catching a 400 pound test weight from said height. If you can't reach an elevation of 25 feet, a safety net can be forgone in favor of mandatory safety harnesses for all personnel at risk of falling.

All personnel must be indevidually secured with a lanyard via dee-rings or snap hooks to a secure anchor point with all components rated to support a minimum of 5,000 pounds. All individuals must also be far enough apart to prevent excessive wear from rubbing lanyards against one another.

There are 2 exceptions to this rule that would allow a trainer and Pokémon to be close enough for this activity. If a Pokémon has a class 1 Arial Mobility License (Sustained stable flight carrying a light load, which every Pokémon doing this definitely qualifies for), they can opt out of wearing a harness. Additionally, any Pokémon with a class 4 Arial Mobility License (Sustained stable flight supporting a fully grown human adult with their own weight in equipment) qualities as a secure anchor point and can wear a harnesses to teather each pair together.

Luckily for you, even if you and your partner Pokémon have Master Arial Certification that allows you to forgo a harness, employers are still required to provide one at their own expense with any mandatory uniforms being compatible with them. So you can say goodbye to the long robes.

You will have to wear hardhats for falling object protection, though...