Come on Celebi we don't want to be late!" Ash called to a little fairy Pokemon. Ash has been friends with Celebi his whole life. Today he was going to start his journey and Celebi wanted to go.
(flash-back)
A five year old boy with midnight black hair and black eyes was playing in the forest next to pallet town.
While the little boy was playing with a Mime Jr., he heard a pokemon cry. The little boy and Mime Jr. ran to the sound and saw a small pink fairy-like creature being tackled by an Exans with two people, a Meowth, and a Weezing behind it.
"Stop that let it go." the little boy yelled, as he ran over and, somehow, pushed the exans off, grabbing the little fairy.
"Hey, that pokemon is property of Team Rocket, so be a good little boy and give us that pokemon." the boy-haired man yelled, who got his answer of a confusion from the Mime Jr., that sent them flying far away.
The little boy and Mime Jr. ran the poor pokemon home and brought her into His room. As he laid the fairy on his bed, it woke and look at him scared.
He noticed this and said, "Don't worry im not going to hurt you. My name is Ash and this is Mimey." Pointing to himself and Mimey. He got some water and wash out all the cuts. He, then, got some Oran Berries from the kitchen for the fairy to eat.
Once he came back from the kitchen, he gave her the berries and sat down on the floor. "What type of pokemon are you? I've never seen a Pokemon like you before." he said to the fairy. He was surprised when heard a female, child-like voice in his head saying. "I'm Celebi. Thanks, for saving me from those people."
A week later, Celebi was better, but did not leave. She decided to stay with ash, so Celebi stayed and lived with Ash, Mimey, and his mother.
(flash-back end)
"I'm coming! Wait up, Ashy!" Celebi cried.
When they got to the lab, Celebi hid to avoid other trainers from catching her while Ash went inside. "Hey Professor Oak, I'm here for my Pokemon." Ash yelled as he walked in.
"Ash my boy! I'm sorry to tell you, but we are out of Pokemon, though here have a luxury ball for your trouble. Maybe next year." Pros. Oak said.
"Okay" before ash walked out.
Celebi waited out side for Ash. When he came out, he look sad. "What's wrong ash? You look sad." Celebi said.
"He was out of starter Pokemon, but he did give me a luxury ball." Ash said showing the ball to her. Then, Celebi got a idea. She quickly touch the Pokeball and was consumed. It shook a few times before it stop blinking. Ash stared amazed. Celebi just went into the Pokeball. He quickly let her out.
"Why you do that Cel(1)?" Ash asked.
"Because it would be safer for me to travel with you and I can be your starter Pokemon " Celebi said with a smile. Ash smiled back.
"Come on lets go tell Professor Oak!" Ash said and they ran back into the lab.
"Professor Oak, I caught a pokemon. Can I please have a Pokedex?" Ash said as he and Celebi came in.
"Sure. What Pokemon did you catch..." Oak said as he turned around and saw Celebi before asking out of amazement, "Ash, you caught a Celebi?"
Ash nodded. "This is Cel. I've been friends with her since I was five." he said. Professor Oak gave him the Pokedex and 5 Pokeballs. Then, Cel and Ash started their journey.
(1) Ash's nickname for Celebi is Cel.