You can email the people behind Pokemon at feedback@pokemon-usa.com. You need to be polite, and check to see if your question has already been answered first though. Take the time to read the guidelines on http://www.pokemon.com/#mailbag before writing, and you will be more likely to get your question answered. They won't send individual responses, but they will post pertinent answers to their site.
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webkinzhelp@ganz.com
I tried looking it up myself! Actualy you have to get the "Ganz" email address instead it's: info@ganz.org
You email the signed permission to the company. There email address is at the bottom of the permission slip.
For questions or general concerns, the email address for the video game company EA would be StockholderCommunications@EA.com. A letter could also be mailed to the secretary in Redwood City, California.
Club Penguin is a company. They don't have "a real email address." Each employee would have a distinct email address. Their contact page is in the related links section. That's probably the best way to get in touch with someone there.