(( Assuming we're going by ASB attack descriptions, here, unless an RP interpretation makes more sense. ))
The harsh wind seemed like it could lift Phren off the ground. The darkness made Phren unable to see, because his body was of the Light, but even pokemon of the Light were blinded when the Light was too much. The darkness did not cause pain; light did, even to its own. But it only burned his eyes - he closed his eyes, and it was still uncomfortably bright but it did not hurt, though he could imagine that if he was in his original body, as he often wished, it would burn.
A comfortable shadow was cast over them, and the blinding-through-eyelids light vanished. After a moment, when coloured spots stopped dancing in his vision, Phren opened his eyes.
Darkrai. Cresselia.
Though they were creatures of the dark and light, respectively, they were both of the night. Cresselia commanded the moon, the greatest light in the darkness, and perhaps that was the reason Night was never truly safe. He could not completely see the once-comforting moon any longer; he could only see hints of the blinding light, because if the light could reach his eyes the shadow would not be covering him. It hurt to just look at the almost-brightness that he could see.
"Arceus has ordered me to destroy the gathering Army of Darkness." Cresselia's voice was light, feminine, comforting (like the moon had been, before it grew harsh and blinding). It must have been the azurill that thought so. "Your resistance is futile, Darkrai. Your Darkness cannot defeat my Light, and you know that." In her voice Phren could hear honesty and rightness. That only spoke of her belief in the Light, but it made him almost want to believe, too. Fortunately, he knew better, but he could pretend otherwise, if he wanted.
Darkrai's response was a chuckle - cold, enough so that the azurill wanted to shrink away and bask in Cresselia's protection. Like most of the Dark, it was not that he thought he was doing the objectively right thing; he understood the pain he might cause, perhaps, and he might even realise that it was not justified, because there was no true justice. He did it for more selfish reasons - if it was really for his people, it was because he valued those of the Dark over the Light, not because he thought they were truly more important. "Yes, but I am not alone," Darkrai said. His voice was more powerful, which Phren liked. "The Army is gathering. Your power is at its weakest tonight, and you cannot defeat the Army by yourself, Cresselia." Darkrai turned to the Army and spoke to them directly, and Phren knew with certainty (hadn't he always?) which side he belonged to. "Come, fellow soldiers. It is time to rise up and defeat the Light."
Yes, that was what he would do, but how? He could feign betrayal, and that would make it easier to strike Cresselia from close range. He might even be able to do it more than once, if he successfully pretended it was not his fault. But the problem with apparent betrayal was that if the others believed it too, they would attack him and he could not survive that. If he allowed enough hints of falseness to seep through, Cresselia might see and understand.
Or maybe not, because Cresselia floated down, barely above the ground; an earthquake might even strike her, if a powerful pokemon used it, because it would certainly move the ground enough. She opened her mouth, and blue light shone from within, a growing orb that Phren knew meant a beam attack. Colours flickered throughout the orb. When the beam came, it seemed to do little but shine some light in Darkrai's shadow, because although the beam shot within the Army's midst, the Army was a group of scattered pokemon and not merely a large mass. Phren would not be surprised if it struck no one.
The grimer shot a dripping liquid mass that left a stain on the cresselia's body; five umbreon charged up a familiar shadowy ball of ethereal energy. A murkrow dove at Cresselia, covered in dark energy, but was then almost struck by a second aurora beam and vanished.
Phren didn't know how much the aurora beam would hurt, but he did not want to find out. Aurora beam was powerful enough, and Phren did not much have a resistance to the cold like half of his tribe had. He'd always been physically stronger than most azurill, instead. Encore was a bad idea, at least until she used something else, and he did not command enough respect to give orders. He bounced over to the one who did, instead: Miss Melpomene. If anything came to him, he could say it and maybe she would, as well; if not, then perhaps he'd have her protection.
There was a bright flash and crackle, and almost miraculously, Cresselia was struck, and then her movements became odd and jerky. Even so, though, Phren knew that most special attacks could be used even when one could not move. Aurora beam would be harder to aim, and psychic did not work on dark-types, yet even so... another aurora beam cut through the darkness and struck a spiritomb. A vicious wind shot out, awakened spirits flying everywhere, but they could not touch Phren even if they wanted to.
The attack was wild and unfocused, so it did not seem to hurt their opponent very much. A softly glowing green haze seemed to surround Cresselia, and he pegged it as a safeguard. Perhaps it would not stop the paralysis, but it would prevent anything else that one might think to use.
Phren did not think to attack, yet. Instead, he began to move in a strange dance known amongst the marill tribe, which the azumarill taught all the toung ones. He felt the great systems that controlled all weather shift slightly. The moves were unimportant, ultimately, and just memorised steps that made this easier. He thought of the water moving in its great cycle, of the clouds thickening and the rain falling, and he focused on that. His steps - for he was no longer bouncing, but was instead moving on his feet - probably represented it in some abstract way. The clouds thickened, darkened, and closed in on the red moon. If he could dim this light so it did not blind him, that would be all he needed. But he didn't have the control of an azumarill, and he felt the first few drops of rain that were then followed by torrenting sheets from the sky.
It was a shame that he had no support moves; with this weak body, it would have been useful. But this he could do.
It was not all useful; the double team clones disappeared when the water hit them, but it didn't matter because he doubted they'd really help if Cresselia wanted to get rid of them - Cresselia could probably use swift, in any case, to determine the real umbreon. Besides, Phren didn't like the umbreon much, or not knowing whether the shadow ball that struck was real or just a double team illusion.
Cresselia didn't seem bothered, because she seemed to have a plan. She stared right at Phren, it seemed, eyes glowing pink, but it was Miss Melpomene with which she formed a psychic link the ghost could not escape. Suddenly it was the banette's movements that were jerky and difficult, and Cresselia could move perfectly. "I should have remembered," Cresselia said in her musical voice. "I will not forget again."
Now two small lights formed in her mouth, red and blue, then she shot it at the umbreon that had attacked her. Signal beam, Phren knew, much more effective against dark-types. It would hurt him, too, though, and he felt useless again. If he attacked, one strike would knock him out.
Instead, he let out a loud wail. "Heeeeeelp!" he cried, loud enough for Cresselia to hear even over the rain. "Help, Cresselia, help me! I don't know where I am! I woke up and I was here and surrounded by all these evil guys, Cresselia, I wanna go home, help me!" Tears flowed freely from his eyes, this time, but they couldn't be seen behind the rain. He'd been behind Miss Melpomene before so maybe Cresselia hadn't seen...? "Save me!"
Dark power laced his words, but it was subtle. He could see her expression shift to one of slight sympathy, and he could see her dropping her guard ever-so-slightly. Fake tears meant his attack against her would be rather powerful, but it also increased the effectiveness of anyone else's moves, at leas the first time, before she remembered where she was.
Summary: It is raining. Cresselia is protected by safeguard and is no longer paralysed. Melpomene is paralysed. Cresselia is being affected by fake tears for the moment, so special attacks will catch her by surprise. Fenos no longer has any illusory clones, and any double teams used while it rains will be destroyed immediately.