The Dodge Challenger Scat Pack is a performance package for the Challenger that includes a number of upgrades and improvements over the base model. One of those upgrades is an upgraded key fob with two keys. So, yes, Scat Packs do come with two keys.
The extra key is a great idea for a number of reasons. First, if you lose one key, you have a backup. Second, it's always good to have an extra set of keys in case you need to give someone else access to your car (like a valet). Finally, having two keys can be helpful if you want to keep one in your pocket and one in your purse or bag - that way you're never left searching for your keys when you're ready to go.