I'm not saying it's for definite, I'm just saying it's a very likely possibility and that if the game designers are going into this knowing that they have a limited number of models they can bring back, they're going to take advantage of that and one of the ways they might do that is by introducing new Pokémon that effectively replace old ones, no matter if the name or dex number says they're the same Pokémon. Galarian Weezing is, as far as the programming is concerned, as different to Kantonian Weezing as Tauros is to Miltank.
But on the flip side, maybe the reason we got a Galarian Zigzagoon family is BECAUSE the Zigzagoon family was maybe originally picked to come back. Badgers are a well known animal in the UK, and with the Zigzagoon family the closest thing Pokemon has to a badger they included it. But then it was brought up "hey, why not make a Galarian Zigzagoon which has the color scheme and behavior of a badger?". And thus it came to be. Now having a limited dex, it could encourage the monster creators to really look through what's available and maybe give Pokemon you wouldn't normally think would get a regional variant to actually have a chance. But in order for that to be done the Pokemon does need to be picked to be included in the Galar Dex initially so, even if it does get "replaced" by its Galarian form they could still allow the original form in via transferring it from Home. Heck, they could maybe even say that, since the Pokemon isn't native to Galar normally, it can't Dynamax thus saving them having to make a Dynamaxed model for it.
Meltan. I am 100% sure Meltan and Melmetal will be available in SwSh, and I ak quite curious of where they are and what classification they will get (actual legendary, mythical, or even normal pokemon?). Would be quite surprised if they are not available in any way.
They have to be in, they totally fit into the aesthetic of the Galar region. They'll probably remain Mythical and so hopefully we'll have a giveaway for those who don't play GO. GO players will get to use it early obviously, though would be neat for it to be a "first day event" like they done with Victini and Keldeo in Gen V (I don't think the early Larvitar and and Jangmo-o Raid Battles count, do they? They're only available if you pre-order the Double Pack).
The weakness to Steel of Fairy Types is unfortunately because they're meant to be skeptical/scared of civilization and technology, and not due to them being afraid of being cut in half.
Actually it's something from folklore, cold iron/steel is said to be a magic nullifier/repeller. Silver also has magic nullifying properties. So it's more then just a mental thing, certain metals in folklore physically harm magical beings. Now this probably came about as a way to bring peace of mind to the simple folk back then, the world is a scary place but as long as you have this chunk of metal/stay in the cities made of metal/there's knights and guards wearing metal armor and wielding metal weapons you'll be safe and upkeep the order.
The resists still don't make much sense.
The Fairy-type resists?
Fairy > Bug: Because Fairy are nature spirits they're higher on the podium of other creatures in the natural world. In addition many modern day depiction of Faeries often show the smaller ones using Bugs as transports so there's also an angle of dominance there. Plus other factors Bug-types would have at their advantage like fear of them or irritating sounds probably don't bother Fairies as they're used to the sounds of nature.
Fairy > Dark: Fairies are supernatural tricksters. Dark-types are maybe good with sleight-of-hand and other confounding tricks, but they're still relatively mundane. However Fairies use magic with their tricks and could probably even use magic to see through them as well, so they know what a Dark-type has hiding in their sleeve. Now of course there are Dark-type who sometimes cross over in supernatural things such as controlling or gaining powers from shadows/darkness, the night time/moon, nightmares, etc., but those probably would all need individual explanations and even then a lot would fall into Fairies just being even more supernatural.
Fairy > Fight: As said above, Fairies are MAGICAL tricksters. While a Fighting-types valor may overcome the simple tricks of Dark-types, Fairies would literally change the world around a Fighting-type causing them to trip up. Fairies are also not completely part of our plain of existence, similar to Ghost-types, so maybe while you're hitting them you're only hitting the part of them that they manifested in our world but not the complete being.
Fire > Fairy: Wielding fire is seen as a thing man does. Also forest fires are a devastating natural disaster which burns and kills plants and animals which a Fairy would probably get their power source from. There could also be the idea Fairies rely on the flow of natural order, the natural cycle, something which fire destroys and fire only consumes and in return only giving a moment of intense heat and light... then nothing.
Poison > Fairy: While poison exists in the natural world, it's not that poison hurting the planet now is it? No, it's manmade produced pollution, chemicals, and radiation that harms nature and we go back to the above explanation. But instead of consuming it's not corrupting, what was once there is now sick, dying, and possibly being twisted. And while after a fire things will grow back, places poisoned may either be indefinitely uninhabitable/infertile or would take hundreds if maybe thousands of years to clean itself up.
Steel > Fairy: Explained above, certain metals are magic nullifiers/repellers.
(that said, I believe that's a western myth, while Pokemon is mostly still based on Japanese culture, I don't quite think I've ever seen a horseshoe in japan :P )
Pokemon has moved on from just Japanese stuff. We have Pokemon based off mythical creatures and even beliefs/sayings which are from all over the world. In fact Japanese folklore don't have Fairies, Yokai is their closest thing (and they have made a few Yokai-based Pokemon part Fairy like Mawile). The concept of a Fairy is a European mythical creature.
To be fair I have absolutely no idea why they picked Dark as secondary type for Alolan Muk other than just... to make it strong. I would guess there is some reason...
Quoting myself from another page's response to why Alolan Grimer family become Dark-type even though it also cleans pollution: "
Alolan Grimer family more changed its poisoning strategies. Alolan Grimer family may clean up pollution, but they also leave around these crystals which have a high concentration of poison in them. So instead of it polluting the environment to slowly try killing everything within and near it, it now throws around these crystals of instant death. Meanwhile, Alolan Weezing is eating the air pollution and exhausting clean air while it digests the poison elements."
I'm so glad Team Plazma didn't try to take over Galar. If they got the Rotom to rebel... 0_o
Considering Rotom is part Ghost-type who like to cause havoc and mischief I'm surprised Galar hasn't had major troubles yet. Can't really punish them if they misbehave.
The leaker mentioned Scorbunny's final evolution as pure Fighting, which I imagine was a mistake and that he intended to say pure Fire type.
Yeah, I think he meant pure Fire as well. Though of course Incineroar is Fire/Dark but that doesn't stop giving it a batch of Fighting-type moves. As of right now Delphox is the only recent Fire Starter who doesn't have any fighting theme to it as its a mage.