Quick tip for those on crystal isles, fjordur, or any map with a big volcano biome with trees, take a wyvern or anything that harvests thatch and you can get a ton to charcoal. Also, take an anky to some sand rocks, in my experience they give a LOT of flint. And just use a doed and any rocks, you’ll get a ton of stone either way. Make sure to bring something that can carry your doed/anky, I’d recommend an argy but if you don’t want to use those guys and you can afford it, a quetzal is best because of their high weight and they can carry more tames on top of a platform. Honestly depends on your preferences though!