1. Rip up and throw away all your cards.
2. Delete the save files of all your games and throw them out.
3. Throw away any other Pokemon related products in your house (stuffed animals, figures, clothing, etc.)
4. Keep a positive attitude and remember that this is good for you.
5. Create an anti-pokemon site like this one.
6. Create anti-pokemon images and animations to put on your site (I don't really condone the use of gory images, but I'm not going to try to stop you if those are what you choose to put on your site.)
7. Keep in mind that Pokemon addiction is like a drug addiction. Once you get hooked, it keeps you wanting more.
8. Think about all the other things you could be spending your time and money on. Instead of buying that copy of Pokemon X or that pack of Pokemon cards, you could be using your money to buy a new pair of headphones, or a new shirt or something. Once you start actually doing this, you'll see how much more worthwhile stuff adds up, and you'll wish you decided to do this a lot sooner!
9. If you watch the show or read the manga, find a new anime and/or manga to replace it with. If you specifically like the idea of monsters and battles, try Digimon, Telefang, or Monster Rancher.
10. If you are one of those people who plays the games to feel a sense of companionship between you and your Pokemon because you have low self esteem or something, recreate that feeling in real life. Get a puppy or kitten or something, something you can spend time with and talk to when nobody else is willing to listen.