Ivysaur

Not long after Togepi and the two Eevee hatched from their eggs, Ash and his friends stopped by a Pokemon Center. Right now Ash was worried about his Bulbasaur. Earlier Ash had battled a trainer and his Rhydon and Ash's Bulbasaur won the fight. But afterwards Bulbasaur collapsed and his bulb was glowing blue. Now Nurse Joy was taking care of Bulbasaur. 
'I hope my Bulbasaur is okay.' Ash thought.
Just then Nurse Joy came out of the room.
"Is Bulbasaur okay?" Ash asked.
"There is no need to worry." Nurse Joy said. "Bulbasaur is just fine. I must tell you though your Bulbasaur is getting ready to evolve. That's why it's bulb glowed blue. A Bulbasaur's bulb glows blue before evolving into Ivysaur." 
Ash was surprised and happy with the news and thanked Nurse Joy.
"Your Bulbasaur will evolve at a special festival for Bulbasaur." Nurse Joy told him.
That night when everyone was asleep, a long line of Bulbasaur walked past the Pokemon Center. Ash's Bulbasaur, who was wide awake, got up and followed them. Charmander noticed Bulbasaur leaving the Pokemon Center and woke Ash up.
"What's the problem?" Ash asked. 
He then noticed Bulbasaur was gone. He woke the others up.
"Bulbasaur's gone." He told the others. 
When they looked outside, Brock noticed a trail of pollen.
"If we follow this pollen." He said. "We'll find Bulbasaur."
The pollen led the group to the woods and some tree roots and vines were thrashing around like mad. They got through the vines and came upon a big garden full of flowers. 
"Wow, how beautiful." Misty said.
"This must be the mysterious great garden Nurse Joy told us about." Brock said.
"Hey look at all the Bulbasaur." Ash said. 
There were hundreds of Bulbasaur everywhere. "They all must be here to evolve; I can't wait to see what happens."
Just then a big tree opened and a Venusaur appeared. It walked towards a big tree stump and climbed on top of it.
Ash opened his Pokedex.
"Venusaur, the Seed Pokemon and the final evolved form of Bulbasaur. The plant blooms when it is absorbing solar energy. It stays on the move to seek sunlight."
The Bulbasaur started to sing and then the Venusaur started to sing. After the singing ended Venusaur bellowed and then the Bulbasaur's bulbs started to glow. The gang watched in amazement as all the Bulbasaur started to evolve into Ivysaur one by one. Ash smiled as his Bulbasaur evolved into Ivysaur.
"People have always debated whether Bulbasaur is a plant or animal." Brock said. "And right now I think that maybe Bulbasaur is a symbol that all life on Earth is connected."
Soon the festival came to a end and the Venusaur and Ivysaur returned to where they had come from. Ash ran over to his Ivysaur and gave him a hug.
"You're amazing Ivysaur." He said. 
Ivysaur was happy and rubbed his head against Ash. Ash returned Ivysaur and stood up.
"Come on guys." He said. "It's now time for us to get out of here."
The group agreed and left the mysterious garden to continue their journey.