The gameplay is essentially the same as ever, just they made a bunch of additions to keep it interesting and help players out. Check the official site for the details (pokemonxy.com) or Serebii for all the changes that were made in the 5th generation games (serebii.net).
As for Solrock and Jynx, any Pokemon is good if you train and use it right. Otherwise you can look on Smogen if you want to see how other people use them.
Playing: Fire Emblem Awakening, Pokemon White 2, Bioshock Infinite I believe in everlasting life in Heaven.