>>45375609>And they affect pokémon in a similar way that dynamax energy does.Again, no. Dynamax in particular was only used recreationally AFTER Rose formed Macro Cosmos and had Magnolia help him develop the bands. Before that, Dynamax Energy simply made wild Pokemon incredible dangers (only held back by sticking to dens) and could even make them go beserk.
Contrasted to Z-Moves, which are specifically pulled off by a bond between trainer and Pokemon, and Z-Crystals, which are guarded by the totems-given out to only those who are deemed worthy. The Totem Aura itself goes wholly unexplained, we have no idea if Necrozma causes it or not. The only hint we have is the effect being similar to the inherent boosts Ultra Beasts get from the wormhole energy, but that doesn't explain the size increase.
Eternatus and Necrozma's effect on their respective regions is only similar superficially.