Why do Pokemon Black's post-game trainers have such high-leveled Pokemon?

Question

E.G. You finish the game at level 50-54, but when I went into the Dreamyard everyone had level 60 Pokemon! Is there a different area I'm supposed to start in?

Comments

I changed it to Black 2 assuming that's what you meant, since the Dreamyard is not post game in Black but it is in Black 2.

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Further access to the lower areas of the Dreamyard is granted post-game where there are stronger trainers, so he probably means Black.

Answer 1

You defeated the Pokémon League! Now you are considered almost the best trainer on the game and now for a bigger challenge, Gamefreak makes trainers of the post-game to be stronger than the Pokémon League. If you see, this happens in all games.

In Pokémon Black a great place for train is defeating Audino at Giant Chasm Plains (85 % Walk - Shaking Spots All) with level between 52 - 55. Hold a Exp. Share /Lucky Egg and defeat as much you can.

Comments

So they're 10 levels higher then me just so I can waste time grinding?

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You must be prepared for everything.
I remember before the Pokémon League I spend 5 days defeating Audinos.. when I went to the Pokémon League all my pokemons were level 60 or higher!

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But is there any particular reason why they want us to spend so much time grinding?