Will wi-fi battle turn my Pokemon to 100?

Question

Do I have to get my Pokemon to lvl 100 to 6v6 wifi battle in Pokemon diamond and white 2?

Answer 1

Pokémon Level: All Pokémon above the level of 50 are reduced to 50 for the battle. Any Pokémon under Level 50 keep their level

As said under the Battle Rules on Serebii

That is if you select Flat Rules. If you choose No Restrictions, then it's whatever level your Pokemon happen to be. This means you have to train them up to Level 100 yourself.