>>26892870Slugma, macargo, magby, magmar etc are not based on combustion and are fire types, lava is not oxygen. So yes, fire pokemon are primarily based on heat energy from all reactions. There's literally a move called lava plume and THAT is fire type. So if someone is confused as to why Solgaleo is not a fire type because it's supposed to be a "reference" to the sun is completely fair.
The reason Solgaleo is steel because of its alchemical reference which is 100% proven correct by its own lore. You are right however, that a sun-themed pokemon does not have to be fire. So the reference to the sun is indirect and more metaphorical. Solgleo being steel has pretty much nothing to do with nuclear fusion or what the sun is made of. If you want to know how it relates to alchemy, go use google.
I do get annoyed when people are like "b-but m--muh sun is fire", but you're also wrong.