After a brief trip through Mount Coronet and an encounter with a mysterious individual, you go east to Route 208.
To the east, you find Hiker Robert, who has two level 17 Geodudes. You get 816 Pokédollars for winning.
Go north and you can battle Black Belt Kyle, who has a level 19 Machop. You get 684 Pokédollars for winning.
Go west from the Black Belt, then south down the stairs, to find an X Speed.
In the water, you can use the Old Rod to catch Magikarp.
Go back the way you came, then go east and you can battle Hiker Jonathan, who has a level 19 Onix. You get 836 Pokédollars for winning.
Go north from the Hiker, then use Rock Smash on the rocks on the left, then go down the stairs to get a Poké Ball.
Go east and down the stairs.
In the grass, you can catch Bibarel, Bidoof, Machop, Meditite, Psyduck, and (only at night) Zubat.
Battles and Items
To the east, you can battle Aroma Lady Hannah, who has a level 16 Combee and a level 18 Roselia. You get 864 Pokédollars for winning.
To the south, there is a hidden jar of Honey. To the east of that, there is a Honey tree.
Southeast of the Honey Tree, talk to the Black Belt to get an Odd Keystone.
Go north and you can battle Artist William, who has a level 17 Mime Jr. and a level 17 Bonsly. You get 1088 Pokédollars for winning.
There are berry trees to the north.
Go into the house to the right of the berry trees, and you can buy berries from one of the people, and talk to the Berry Master to get one free berry every day.
Go outside and go east into the building. Keep going east from there to reach Hearthome City.