This is probably off topic, but I still don't really understand how 252x5 eternamax can be used in PH/BH. I always thought the premise is anything without rom hack, or at least something that you can bring to local battles. But FWIK eternamax can be only obtained by rom hacking den raids, and while you can capture it and bring it to local battles, it always reverts back to orginal form after reloading the save. Without reloading saves for pkhex, wouldn't the total ev be limited to 510 in-game? Or is this a special case allowed by the community?
Here's the video showing the Crowned Dogs hacked in: