Be careful of a new virus being sent through email. It seems that somebody has created a dangerous virus and is using PIKACHU to make people download it!
The email will seem very happy, with Pikachu saying things about being your friend. If you get this sort of email, delete it at once, then empty it from your Trash folder. If you click around the email your computer could be infected by the virus.
Never download things which may be dangerous, even if it has Pokémon in it. Download only from trusted sites. Always use an Anti-Virus program to check something before you use it.
And please, don't EVER make viruses or pass them around to cause trouble. No one likes their computer being infected, and I'm sure you don't either. It may seem fun and clever, but there is already a law that gives severe punishment for doing things like that.
Have a good time surfing today. And don't trust every Pikachu you see. Back to Poké-Business!