Liam placed the GS Ball into the slot. There was a blast of bright light. When it cleared, sitting on top of the shrine was Celebi.

"[i]Celebi, The Time Travel Pokemon. This Pokémon wanders across time. Grass and trees flourish in the forests in which it has appeared. It is said that Celebi will only appear in peaceful times.[/i]"

Liam placed the Pokedex back in his pocket. Celebi was flying around the forest having fun. It then returned and floated in front of Liam. and took a battle pose. Liam called on Cynder. The battle began. 
 "Cynder, Ember!" Liam called. the small flames flew forward and hit Celebi. Celebi used Ancient Power, hitting for super effective damage. Cynder next used Flame Wheel and Celebi used Magical Leaf. The battle continued on like this for a couple minutes. Liam readied a Dusk Ball and tossed it at Celebi. Given that it was dark, although that may have just been because the forest was so thick. Celebi got sucked into the ball. It pinged for two minutes straight. It was the longest two minutes of Liam's life so far. The Ball finally snapped shut. He walked over and picked up the Dusk Ball. "I got Celebi!" Liam exclaimed. He then noticed that all the trees stopped shaking.