Also... in my heartgold game I caught Pokerus.... wtf is that????
It's a rare pokemon disease that you WANT to keep circulating about your pokemon as, like cookies says it'll disappear. It boosts the EVs of a pokemon and makes them really powerful when they level up. If you have an infected pokemon in your party, the other party pokemon will catch it. It's mostly weffective with low level pokemon whom you plan on training to become stronger. Most pokemon will become immune to the virus but you can save it by putting infected pokemon in your PC(other PC pokemon wont be infected).
I caught the disease and spreaded it around in Platinum or Diamond . I think I put an infected pokemon in my PC though so I could spread it around. It's really worth having.
~Also I really like the new Mewtwo pokemon thing. It's not so bad.