Michael crouched down when he noticed the Pokémon hid behind his legs and put his arms around the shivering Pokémon. Lytse also joined them and put a paw on him. Usually he was the one needing comfort when he was scared, and he never thought he would be the one trying to comfort someone else.
"Why are you afraid?" Michael asked him.
When he noticed Niccia was pulled towards Arceus he almost got up, but a gesture from his uncle made him stop before even starting. 

Andy watched it with his arms crossed; while he was worried about Niccia, this wasn't something Michael should come between. Glancing around he noticed almost every legendary Pokémon had their eyes on the scene. A few hadn't noticed, or deliberately didn't give it any attention. But two had an unusual fascination with the portal. Did they want to leave now that Arceus was angry?
"Merlin, we can spare you from this scene," he said while nodding towards the Pokémon backing away from the portal.
The Noctowl didn't need more information and spread his wings to check out what was going on there. 

Gathaar and Handeer turned to Yalgai when she joined them and Gathaar nodded. "So it seems," he said and he narrowed his eyes. "What is going on between him and Niccia?"
While he noticed the Noctowl flying away, he didn't pay attention to it and kept his eyes on the situation between Arceus and Mew.

When Ra noticed the arm, he grabbed Luna's arm with his free hand and pulled her to the side, growling softly as he did. "Can you take Tarian too?" he asked Luna. "I'm going to change back into my Pokémon form."

Merlin, who didn't even need his keen eye to see it, noticed the black arm going through the portal, and by the way they legendary Pokémon were reacting he decided it was a bad thing. 
Using his Echoed Voice in the air - he didn't want to hit anyone or anything with it - he alerted Andy and the others, who all turned to look at him.

"Go on," Andy said, and Benny and Bear both left to see what Merlin wanted to warn them about. Kim stayed by Andy's side, and after watching the two others leave, she turned her attention to what was going on between Niccia and Lecrero.