I know, I like it when that happens, too... but since this is a Nuzlocke...
It wouldn't matter anyway, since basically the third phase of the battle is basically me vs this creature with all of the power of the dead Pokemon/Touhoumon filling whatever is alive up.
... Whereas this pokemon is being fed by three souls that will be revealed later on, as she has possessed them at one point, as well as the power of the 3 pokemon/Touhoumon Big Bads from the Johto Arc.
Yeah, I'm turning this into a fanfic eventually, if this can be finished, anyway.
I know Pokemon Snakewood was able to do something like that but you HAVE to white out before you can go forward plotwise. Like in new mauville when you have to fight Watt-son and he has lvl 100's and since you can beat them you have to let your Poke's die and then come back and step on the generator that kills their power.
I think Identity did some cool stuff with their hack too.
I don't play to many Pokemon hacks unless they REALLY appeal to me like Identity or Snakewood did. I hate the typical "new evil team, new region, catch all pokemon" thing, it's to overdone. I need to see something NEW. Those games also didn't give you to much crap about getting badges either.
I would love to make a hack of Lunar Dawn but my laptop thinks all the hacking tools are viruses and deletes them lol. And I don't know crap about spriting and mapping..and scripting..etc. So, I couldn't do it anyway, lol.
It can't be caught, and in the first phase, it is invincible. You'd have to let it wail on you for a couple of turns, until plot comes in and breaks the barrier. (Wouldn't be able to put this in anyway)
At that point, you fight a pokemon with stats if that pokemon were Lv. 150 or 200. Its stats are either equal or above Arceus' 120s, with the exception of HP, Def and SpD. Which is strong.
By this point, you should have pokemon which CAN fight it, but since it is a plot fight, and not a real fight, I can make it as long as I want, tbh.
Also, if you run into a Lv. ? Pokemon, would you be scared or no? I'm trying to see if a Lv. ? Final Boss is good enough or no. (Screenshot editing is what I'm doing for it, since I can't hack it into the game. (It IS blocked off)