GROOMING
Pomeranians are sometimes called "Puffballs with feet" and require careful grooming. Poms do not need as much grooming as some other long haired dogs, however you should brush your Pom 2 or 3 times a week. Be prepared to do extra brushing when the dog is shedding. This toy dog's coat should not be brushed when it is dry. It is best to mist the coat with a bit of water first. If you desire, you may add a bit of conditioner to the water, as well. A bristle or a pin brush is recommended for a Pomeranian. All loose hair from the dog must be removed or the Pomeranian's may get matts which would then need to be removed by clipping. In the case of pet Pomeranians, for the purpose of cleanliness, it is recommended to clip the hair around the Pom's anus. When brushing your pet, make sure to pay attention to the area behind the ears and the groin area, as these areas are problem areas prone to knots and tangles.

from img.quamut.com/chart/1411/06_
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Ear mites will cause your pet to scratch at his/her ears, which will cause the hair in that area to matt very quickly. A quick run down is that you should bath your Pomeranian on a regular basis. It is very important to wash your Pom often because dirt and dust are abrasive to it's coat. Show dogs should be bathed weekly and at 4 to 6 week intervals during winter months. Bathing is helpful in stopping many of the skin irritations that Poms can have. It is recommended that show dogs be bathed 2 to 3 days before a show. The use of talcum powder on Pomeranians should be done very sparingly. Nails should be kept as short as possible on this toy dog. Trimming should be done at least every 3 months. If your pet has any unremoved dewclaws, keep those trimmed short also. If nails are not trimmed regularly, they will become overgrown and continue to grow inside the dog's flesh (www.petpom.com/).
Check out this video on how to properly groom a Pom by Pet Grooming by Diana from youtube.com:
Check out these pictures of pomeranians being groomed: