Start of Ash and Tomo's Sinnoh Journey

Ash and Tomo finally arrived in Sinnoh. 
"I feel like this journey is going to be great." Tomo said. 
"So do I Tomo." Ash said. "It will be fun to see all the places in Sinnoh and catch new Pokemon. And of course participate in the Sinnoh Grand Festival and Sinnoh Pokemon League." 
Yes the Ketchum brothers thought that this Sinnoh journey would be great just like their previous journeys.
The first thing they had to do was call Prof. Oak and tell him they arrived in the Sinnoh Region. Prof. Oak was happy to see the boys made it there safely.
"Prof. Rowan lives in Sandgem Town." He told them.
"Thanks Professor." Ash said. "We'll call you as soon as we get to Sandgem Town." 
"Good luck you two. Oh and make sure to mind your manners when you meet Prof. Rowan. He can be quite strict." Prof. Oak said.
The brothers promised to be on their best behavior. They finished the phone call and headed to Sandgem Town.
Now it was time for the Ketchum brothers to start their new journey.
"Keep your eyes peeled Tomo in case we run into any wild Pokemon to catch." Ash said.
"I will." Tomo replied.
Growlithe kept his eyes open too.
"Okay Riolu since this will be your first journey, you must pay attention to your surroundings." Ash said.
'Yes papa.' Riolu said.
Riolu was out of his Poke Ball and rode on Ash's shoulders.
Just then they came across a Pokemon that looked like a beaver.
"What's that?" Tomo asked.
He opened up his new Pokedex.
"Bidoof, the Plump Mouse Pokemon. With nerves of steel, nothing can perturb it. It is more agile and active than it appears."
"Cool, that's my kind of Pokemon." Tomo said.
"Growlithe, Flame Wheel." He ordered. 
Bidoof was knocked out instantly.
"Oops, maybe Growlithe is a bit too strong to use." Tomo said.
"It doesn't matter." Ash replied. "It helps catching weaker Pokemon easily and it will show Bidoof how strong Growlithe is. Now hurry and catch it before it gets away."
Tomo quickly tossed a Poke Ball and caught Bidoof.
"Well done Tomo, you got your first Sinnoh region Pokemon." Ash said. 
This was true; Ash already had six Pokemon from the Sinnoh region (including Leafeon and Glaceon) and Tomo didn't have any at all. So this was a good start for Tomo.
After capturing Bidoof, the Ketchum brothers continued heading to Sandgem Town. Suddenly a Officer Jenny on a motorbike came up to them.
"Are you two Ash and Tomo Ketchum from Pallet Town in the Kanto Region?" She asked.
"We are. Why?" Ash questioned back.
"I was asked by Prof. Rowan to pick you up and bring you to his lab." Officer Jenny stated. "He heard about you two from Prof. Oak in Kanto and since you're new here he figured you wouldn't know how to get to his lab."
The brothers were grateful and accepted the ride. 
"Do all Nurse Joy's and Officer Jenny's in the Sinnoh Region look identical?" Ash asked.
"They are." She nodded.
He had the feeling that was the case, but wanted to know regardless.
Thanks to Officer Jenny, Ash and Tomo made it to Prof. Rowan's lab.
Right off the bat, they saw how strict Prof. Rowan looked.
"I have heard about you two boys." Prof. Rowan told Ash and Tomo. "Especially you Ash, Prof. Oak told me you are quite the impressive trainer."
"Oh well." Ash said.
Prof. Rowan then noticed the Riolu on his shoulder.
"I'm impressed already since you have a Riolu, which are hard to find." He said.
"I received Riolu as a gift back in the Kanto Region." Ash explained. "It's a long story."
"Well I would like to hear this long story and other stories you have to tell." Prof. Rowan replied. "As a matter of fact, Dawn might like to hear these stories as well."
"She's a beginning trainer and could possibly learn from you." He explained.
"Well Tomo and I can go meet her." He said. "Besides we want to go and find new Pokemon to catch."
"I see." Prof. Rowan said quietly. "Dawn is probably on Route 202 to capture Pokemon herself." 
"You boys find her, come back to the lab and then you can tell me about your journeys." He added.
The boys then began their search for Dawn.
Meanwhile
Dawn was searching for new Pokemon along with Piplup, who was in the basket on her bike. They soon ran into a brown and cream colored rabbit Pokemon called Buneary.
Dawn looked Buneary up on her Pokedex.
"Buneary, the Rabbit Pokemon. It slams foes by sharply uncoiling it's rolled ears. It stings enough to make a grown-up cry in pain."
Dawn thought it was really cute and decided to capture it.
"Bubble Beam." She told Piplup.
Buneary dodged the bubbles and used Dizzy Punch on Piplup. The attack knocked Piplup out; it was obvious Piplup was still weak. The Buneary got away and Piplup hung his head in shame.
"Hey, no need to worry Piplup." Dawn said. "We can just try again. I'm sure we'll run into another Buneary later."
Piplup picked himself up like nothing happened; he really was full of pride.
Dawn and Piplup set off again. This time they ran into a black and green Pokemon resembling a small bush.
Dawn looked it up on the Pokedex.
"Burmy, the Bagworm Pokemon. To shelter itself from cold, wintry winds, it covers itself with a cloak made of twigs and leaves."
Piplup was up for another go, but Dawn released her Ariados to weaken Burmy. 
"String Shot." She told it.
Burmy was wrapped up in the string.
"I think that may have been a bit much." Dawn said.
She suddenly remembered her Poke Balls and threw one at the trapped Burmy. Burmy was caught. Dawn was happy.
"Alright I caught a Pokemon!" She cheered.
Ariados then squirted it's string at Dawn; it didn't like Dawn praising herself. 
"Okay, okay, you were great too Ariados." Dawn said.
She didn't like having string stuck to her face. She then returned Ariados. Piplup wasn't happy either because he wanted to battle Burmy.
"Piplup, you already had a chance to battle. It was Ariados' turn, besides you were weakened by Buneary." Dawn said.
Piplup still sulked. 
"I'd say this is a good time to head to the Pokemon Center." 
By now, Ash and Tomo were still looking for new Pokemon to catch when a truck appeared out of nowhere and Brock exited it.
"Brock, hello." Ash said, happy to see him again.
"Tomo called me and told me you returned from your training, Ash." He said. "So now I can travel with you guys again."
The Ketchum brothers were happy to hear that and so were Pikachu and Growlithe.
"Thanks for the ride." Brock told the truck driver who proceeded to drive off.
Brock then noticed Riolu.
"Where did you get that?" He asked Ash.
"I'll tell you after we get back to Prof. Rowan's lab." Ash replied.
"Right now we're looking for a new trainer named Dawn and then we'll return to Prof. Rowan's lab to explain everything in full." Brock agreed to go with them.
Just when the group continued their search a Starly appeared in front of them.
Ash looked at it on his Pokedex.
"Starly, the Starling Pokemon. They flock in great numbers. Though small, they flap their wings with great power."
"That's my kind of Pokemon." Ash said.
He decided to catch it. The Starly saw the group and prepared to tackle them.
"Pikachu, counter with Quick Attack." Ash said.
Pikachu tackled Starly. As it was a lot stronger, Starly fainted. Ash then tossed a Poke Ball and caught Starly. 
"A new Sinnoh Pokemon for me." He said.
Starly's Poke Ball was transported to Prof. Oak's lab since he already had six Pokemon.
With Brock traveling with them again and a new Pokemon captured the group could now continue searching for Dawn.