After you pass through the maze-like Route 13, you reach the last part of the maze in Route 14.
Explore the Route
If you are in the northern half of the maze, you can battle Camper Beck, who has a level 37 Flareon. You get 740 Pokédollars and 2 Great Balls for winning.
If you are in the southern half of the maze, you can battle Camper Carter, who has a level 37 Psyduck and a level 37 Dugtrio. You get 740 Pokédollars and 2 Great Balls for winning.
Go to the northernmost part of the maze, then go east until you are back in Route 13. You will find a Full Heal here.
Go west from there to return to Route 14.
Then go south. You will battle Bird Keeper Benny, who has a level 39 Pidgeotto and a level 39 Fearow. You get 2340 Pokédollars and 3 Poké Balls for winning.
To the right of the Bird Keeper, there is a Hyper Potion.
Go west from there, then chop down the tree that is southwest of the Bird Keeper. Go west, then north, and you will battle Punk Guy Felix, who has a level 38 Weezing. You get 1064 Pokédollars and 3 Poké Balls for winning.
Go north and you will battle Roughneck Zeek, who has a level 38 Machoke. You get 1064 Pokédollars and 3 Poké Balls for winning.
Go north to find a Nugget.
In the grass to the north, you can encounter Pidgey, Weepinbell, Tauros, and others.
Check in the upper part of the grass to find a hidden Golden Razz Berry.
Go south and you will battle Punk Guy Gerald, who has a level 38 Magmar. You get 1064 Pokédollars and 3 Poké Balls for winning.
Go south and you will battle Punk Guy Malik, who has a level 38 Rhyhorn. You get 1064 Pokédollars and 3 Poké Balls for winning.
Go south and you will battle Punk Guy Harvey, who has two level 38 Raticates. You get 1064 Pokédollars and 3 Poké Balls for winning.
Go southeast and you can battle Bird Keeper Donald, who has a level 39 Fearow and a level 39 Pidgeot. You get 2340 Pokédollars and 3 Poké Balls for winning.
West of there, you can battle Ace Trainer Kindra, who has a level 40 Vaporeon, a level 39 Dodrio, and a level 39 Sandslash. You get 3900 Pokédollars and 5 Ultra Balls for winning.
Go west from the Ace Trainer and chop down the tree, then go west, and you will be in Route 15.