Bearded dragons do not get lonely. They are solitary animals. Most of the time bearded dragons who live together end up fighting even as babies (biting off toes or tails).
If one is larger than the other he/she can try to eat the other as well resulting in the possible death of both. I briefly housed two females together as hatchlings. They lived together well for a few months before one started losing a lot of weight while one started packing on the weight since she was stealing all of the food and attacking the other one at feeding time.
It is in general a bad idea to put two together. If you insist on them living together have a separate setup ready to go in case they do not get along.
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