Many make the mistake of thinking that grimer and muk are capable of gaining nutrition from any kind of matter, whether organic or inorganic. While it is true that the species is willing to consume most materials, they have trouble digesting metals, rubber, and some kinds of plastic. In areas of Alola where refuse is partly disposed of by being fed to muks and grimers, dustbins are labelled according to what the species is able to digest.
While not a matter of dietary requirements, many serious competitive trainers feed their muks exclusively on fluids; the process of digesting solids can make them heavier and more cumbersome, which impacts on their performance in battle.
Some fire-type carnivores (such as pyroar, incineroar and houndooms) can grow ill from eating raw meat. As their typical hunting methods would usually see them ‘cook’ their prey, they never evolved to be able to stomach raw flesh in the way that other predators can. Other fire-type meat eaters - like arcanine and flareon - don’t have this problem.
Although many trainers have tried to convince their kadabras and alakazams to eat ice cream with their spoons, this is ill-advised in regards to dietary requirements. The abra line is lactose intolerant and eats very little. Their minimal diet is composed of smaller bugs, fruits, and lots of water.
Steelix are capable of digesting most rocks, but the high sodium and potassium content of alkalic minerals can make them briefly unwell.
It has been found that the different heads of species like doduo, dodrio and zweilous can have different allergens. This problem is most present in the doduo line; sometimes one head will react adversely to certain kinds of grain, causing the throat and tongue to swell. This can be difficult to deal with, as feeding one head separately from the others - which is necessary when one has allergies - often causes squabbling and aggressive behaviour.
While zoruas and zoroarks may be able to present as human, trainers must prevent them from eating human foods such as chocolate, onions and cheese, as much as they might want to.
Sometimes people take bags of fake gems to scatter and feed to the more adventurous sableye in the caves near Dewford. Clear glass gems aren’t harmful (though they aren’t particularly nutritious), but coloured gems can be toxic owing to the dyes used to create the pigments. Plastic gems are an absolute no-no, though most sableye are savvy enough to turn their nose up at them.
Some make the mistake of thinking that munna and musharna can sustain themselves on dreams alone. Rest assured, they also need a diet of fruit, veg and berries in order to thrive. Eggs are to be avoided.
Scrafties will frequently attempt to consume fizzy drinks and alcohol, even though both are toxic to them in large doses. It’s easy enough to keep trained ones away from the stuff, but if a wild scrafty pinches your cider, it’s probably best to just…let them be.
Unlike the Muks in Kanto, Alolan form Muk is strikingly colorful. Alolan Muk looks like a colorful oil slick. Soap, petrol, grease, and other oily substances often look like colorful rainbows. But why?
Oil is both reflective and refractive of light. When light hits it, some of the light bounces off the surface and directly to your eye. The rest of the light passes through the oil, and then bounces off of whatever surface is beneath the oil (water, the road, Muk’s body) before going to your eye. Passing through the oil bends the light a little bit. It’s a lot easier to walk through air than through water: you move slower when you’re in a swimming pool. Light is the same way, it slows down in water and oil, which causes it to bend.
Because of this effect, you can think of it as one beam of light going to the oil, and two beams of light coming off of it: one from the surface reflection, and the one that passed through the oil.
We don’t see two different beams leaving the oil, of course: the two beams combine together to create a new light beam altogether, through interference. Interference can make light stronger or weaker, depending on how the waves add together.
White light, of course, actually contains all of the colors of the rainbow. When light refracts and reflects off of the oil, different colors are going to combine through interference. Depending on the depth of the oil slick in different places, red might combine with red to create a really strong red, and so on. This constructive interferencecreates the rainbows in oil.
This is how Alolan Muk is so colorful: the outside of its body is coated in a layer of fatty oil, which interacts with the light in this way to make it colorful.
Alolan Muk’s body is covered in a layer of fatty oil. Some light reflects off of the oil, and some light passes through it, causing constructive interference that appears as a rainbow.