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There are many reasons this can happen, but the most common is a water issue. Either the plant gets too mach water or too little water. Have you had a change in how much water is available to the plant? Was it perhaps overwatered at some point this year or are you going through a drought?

First, I would check for signs of life. This article will help with that: https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

As long as they are still alive, I would keep them where they are and continue to water. Tamp or step on the soil around the base of the plants to help collapse any air pockets, which may have be keeping the roots from taking up water. If you did not prune when you moved them, I would prune back by 1/3. This will help the shrubs focus on re-growing the roots. Also, give them some bone meal to help boost phosphorus, which helps with root development.

I would prune it back by 1/3 and no more than that in one given year, as this could damage the plant. This article will help you with the basics:
https://www.gardeningknowhow.com/ornamental/shrubs/holly/trimming-holly-bushes-how-to-prune-holly-bushes.htm

Pruning is basically sculpting the plant. If you are aiming for a round shape, then start shaping them that way. If you need to remove more than a few inches to do this, you may want to take a little off this year and then do more next year, shaping the plants gradually.

Could you send in a picture? This would help us to better identify the plant for you.

It sounds like sooty mold, which is a symptom of several kinds of pests that can attack hollies. I recommend treating the plants with neem oil. This will kill any pests on the plant and treat the sooty mold as well. This article will help: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

This could be scorch or a fungus of some sort. Scorched plants normally recover on their own, but you will need to treat the shrubs with a fungicide to deal with fungal issues.