It’s mostly fur, actually. They are, as my partner puts it, “round and fluffy,” and they are perfect the way they are.
I think this anonymous was asking about the reason behind the adaptation, Bill —LH
Edit: Oh. Well, that’s simple, anonymous. They were deliberately bred that way, to be honest. Because Alolans, too, acknowledge the wonder of a fluffy mane. (This may or may not also be why there are feral eevee on one of the islands.)
Uh, excuse me miss editor, but why do you know how many threads are on this forum and whether or not they’re stickied, hm?
Come to think of it, this is a very good question, Lanette.
Oh, please, Bill. That username you think you’ve cleverly kept secret? Is not a secret. Nor is it all that difficult to Google. All of us know which message boards and subreddits you frequent in your spare time. —LH
Actually, I don’t often bring up the subject of breeding because not all behaviors have to do with sex, contrary to what Freud may have you believe.
Joking aside, whether or not it would be prudent to have a pokémon breed depends on completely on circumstances. If a pokémon is depressed, then companionship may be the best solution, as many pokémon are actually social in nature. However, aggression is a sign of unchecked sexual frustration, and sometimes, neutering can allow a pokémon to gain control of their temper by reducing their hormone levels to a manageable state. Likewise, if it’s clear that the owner doesn’t wish to raise young or if the pokémon wanders off to mate with a large amount of wild pokémon (or pokémon owned by other trainers), neutering may help to reduce a pokémon’s urges, which in turn will help control the population of unwanted hatchlings.
In other words, whether a pokémon should breed or should be neutered depends entirely on circumstances. In some cases, one is simply a far better option than another. Likewise, it’s also worth it to note that although I was largely kidding in my first line of this response, it’s true that not all instances of aggression or wandering have to do with a pokémon’s libido. Sometimes, they’re simply signs of stress, lack of sleep, or something far, far simpler than sexual frustration.
It is indeed impossible for two reasons. First, volbeat and illumise are genetically incompatible with human beings, and thus, they can’t crossbreed (regardless of what early Sinnohan myth may say). Second, one would assume that “please do not engage in intercourse with wild pokémon in the hot spring” would be among your policies because of sanitation issues.
The Pokédex According to Bill 