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Twinleaf Town
Once you begin the game and choose your character, along with naming them and your rival, you'll start by viewing the T.V. with the message of: "Pokémon are by our side, always. I hope you will understand the meaning of those words.", which is a quote from Professor Rowan. Once the T.V ends its broadcast. Head towards the stairs of your room and then Barry will appear and will note that Professor Rowan who is famous for studying Pokémon is what the TV report was about and suggests that the two of you should head to him to ask for a Pokémon. He will then leave to meet you outside.
After talking to your mom, leave your house, but not before your mom reminds you not to go into the grass because of wild Pokémon. Head for Barry's house, which is north western of your house. And, just as you enter, he exits the house, only to realize he forgot something. Head to the stairs in his house and afterward, he leaves again. Now, you should meet him on Route 201, which is north of Barry's house.
Route 201
Barry meets you at Route 201 and is ready to head to Sandgem Town with you only to realize that neither of you has a Pokémon yet and can't go into the grass. Regardless he is prepared to run with you into the grass, but before he makes it Professor Rowan appears. Recognizing that you both don't have Pokémon and considering what you both tried to do once you agree with his statement that you both love Pokémon twice, despite finding both of you reckless for going into the grass, he agrees with giving you a Pokémon.
Available Pokémon
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This is when Lucas/Dawn appears and brings the Professor's briefcase with him. The professor thanks him. Despite Lucas/Dawns' protest about giving their crucial Pokémon away, the Professor will remind him there are times when Pokémon should meet people. Once the Rowan states it's okay to take one Pokémon, Barry will let you go first so approach the Briefcase and choose.
Once you made your choice, like any Rival, Barry will pick the one that has the type advantage over your choice. Rowan will point that these Pokémon are inexperienced with the world and needs you to help them grow before he and Lucas/Dawn return to Sandgem Town. Barry will them challenge you to an immediate battle which is similar to Blue in the Kanto-region games. Just remember this is a battle you don't have to win.
After the battle you will immediately go home.
Twinleaf Town
Back at home your mom is happy that you and Barry met Professor Rowan since it stopped you from being attacked by wild Pokémon. She then asks for you to thank him properly in Sandgem Town and gives you the Running Shoes.
Lake Verity
After arriving back on Route 201, you'll meet up with Barry again. Even though both of you are going to Sandgem Town, he suggests that both of them should head to Lake Verity first to find and catch the legendary Pokémon to show to Professor Rowan first.
Once at Lake Verity you will see Cyrus, the leader of Team Galactic, who calls out that he will one day take control of Time and Space to the legendary Pokémon of the lake before he leaves. When Barry is ready to press forward you will hear the legendary Pokémon, and is ready to catch it only to realize that neither of you have any Poké Balls to catch it with. Barry then recalls that Professor Rowan said to come to him if they needed anything and so Barry decides to ask for some Poké Balls and immediately departs for Sandgem Town.
Available Pokémon
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Route 201
Once past Verity Lakefront, you are free to explore the tall grass though you can't catch any wild Pokémon yet. Talk to the Poké Mart Employee in that is located at northern point near the exit to Sandgem Town to receive a free Potion. Head east to reach Sandgem Town.
Sandgem Town
Once you arrive Lucas/Dawn are waiting to take you inside the building, just as Barry comes out, commenting that Rowan is not as scary as he appears to be before leaving. Once inside the Professor takes a look at your Pokémon and agrees to let you have it. Seeing the growing bond between you and your Pokémon, the Professor gives you a Pokédex to record data on the Pokémon with.
Outside the lab Rowan gives you TM27 (Return), then Lucas/Dawn shows you around Town then suggests to talk with your mom. Leave Sandgem Town and then use the ledges to return to Twinleaf Town.
Twinleaf Town
Once back, your mom gives you permission to go and gives you the Journal, encouraging you to have fun on your adventure. That's when Barry's mother shows up, looking for Barry, and gives you the Parcel, and believes that Barry should be at Jubilife City right now. Now return to Sandgem Town.