"Celebi..." was the only thing that David managed to get out of his mouth and stared at the little time travel Pokémon he held down with his hands…
Celebi however looked disappointed and spoke "Would you mind releasing me? I have a lot to do today!" His reaction however was that he just blinked still unable to think clearly from the shock that he just catch a legendary Pokémon. After a short time she had enough and used a weak Physic attack that didn't hurt him much but caused him to loose the concentration that David needs to hold his human form. He changed back to Mew form and Celebi got free.
She floated at eye level in front of David and giggled "You look really handsome as Mew!"
David blushed but Celebi replied: "Don't worry… I may want something from you but I need Iain as well and it isn't for a relationship!"
David wondered what she could want from him and decided just to play along. He went with her to look for Iain in the lab and he was absolutely busy with the serum.
As he noticed somebody came in he turned around and greeted David. But he was confused that Celebi was here. Iain knew his friend was never able to catch it… even if he had tried to find her… he never had much interest in this Pokémon… he asked "Uhm… David… what is Celebi doing here?"
"I don't know… she just showed up and told me that she want something from us…"
"Indeed!" chirped Celebi and took a deep breath "You are called to a hidden section of Mt. Battle in Orre…" she explained "Because you are in trouble…"
"What kind of trouble?"
"Arceus will judge you in the trial of the legendaries…"
Iain thought to himself, "oh dear...this can't be good..."