https://pixelmonmod.com/viewtopic.php?f=146&t=27431
but here is another, in order to get eternamax, you would have to beat eternatus in a max raid battle with it being in its eternamax state. and that being the only way to get eternatus with its eternamax capability already included with it. as for gmax soup, i cant say much about that considering the isle of armor hasnt been released, but it could have a crafting, or cooking recipe for it. and it could give gigantamax features to whatever pokemon recieves it. as for dens, that is one topic that we will not know much about until the crown tundra gets released, but that could possibly give us a way to alternatively get legendary pokemon besides waiting for them to spawn.