The only way that I know is to breed a female rhyhorn/rhydon with a male torkoal which has curse. Then you breed the resulting rhyhorn (male) with curse with your female swampert!
If you need any more help like this, visit this thread: http://www.serebiiforums.com/showthread.php?t=69461
Blaziken God has right, the baby will be like mother and the baby's moves will be similar to it's dad. So, you need a male pokemon with curse that can breed with Swampert.
Thanks so much! I thought there might be a breeding chain like that involved, but I wasn't sure which Mods, you may close this post now, my question has been answered.