How do you get past guys by crates at fight arena when finished pokedex?

It sounds like you're referring to the "Battle Subway" in Pokémon Black and White 2. You're trying to reach the trainers past the crates blocking the path, right?

Here's how you do it:

1. Talk to the Subway Boss: After you complete the Pokédex, the Subway Boss will appear. You'll find him at the entrance to the Battle Subway.

2. Complete the Subway Challenge: The Subway Boss will challenge you to a series of battles. You need to win 10 consecutive battles. The difficulty increases with each battle.

3. Reward: Upon winning, the Subway Boss will open the crates, allowing you to access the rest of the Battle Subway.

Important Notes:

* You can choose to battle in singles or doubles.

* You can use any of your Pokémon in the Battle Subway, even those not in your Pokédex.

* You can re-battle the Subway Boss and his team after you win.

Let me know if you have any more questions about the Battle Subway!