SPA chapter 3!

Here is chapter 3 in the Pokemon story I'm writing. At first it seems it has no relevance and is just filler, but at the end it has something very mysterious and important!
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Chapter 3 - Vs Pikachu
"Well guys It's almost night time!" Sparky said to his team "And i'm sure the 3 of you will all get on fine!"
Sparky turned to Oddish.
"Oddish, What's that you got there. Is that an Everstone? You don't wanna evolve. Well I wouldnt want to evolve you anyway. You're so cute at this stage! So just hang on to the Everstone! Hehe!"
The group were about to go to sleep, but were woken up abruptly!
***
"Piiiiiiiii!!!!!!" shouted a voice in a crackly voice.
"What was that! Sounds like a Pikachu shocking something. Let's go find out!" said Sparky.
Sparky and his 3 team members ran towards the voice and saw a wild Pikachu trying to knock down some food from a tree.
"Hey Pikachu, you need help there!" Sparky said as he took the food off the tree and gave it to Pikachu.
Pikachu wanted to do it himself as it was stubborn! It attacked!
***
WILD POKEMON BATTLE!
Wild Pikachu Appeared!
Sparky sent out Oddish
Oddish used Stun Spore
Pikachu was Parlyzed
Pikachu used Volt Tackle
Pikachu was hit with recoil
Oddish used Quick Attack
Pikachu used Tackle
Sparky threw Pokeball...
Pikachu was successfully captured!
***
"Well I caught a Pikachu. I already have an electric type in Rotom so I'll put Pikachu in the box. Besides it's a bit stubborn and angry so I don't think it'll listen well in battles. What was weird is that this Pikachu knows Volt Tackle which it can only learn via breeding with Light Ball! And this Pikachu is holding an Aspear Berry which is completely different to a Light Ball. Seems as if it's pretty rare. Let's put it the box when we get to Pewter City! We set up camp here and then tommorow we get to Pewter City, sort things out and then train for a bit!" Sparky explained.
The team set up camp again and went to sleep for the night.
***
The next morning, Sparky, Rotom, Torchic and Oddish got to Pewter City. Pikachu was deposited in Sparky's box system. Then the team got to training.
What Sparky didn't notice is that a strange dark shadow flew over him.

"Raiiiiii" it growled.
***