Walkthrough
Cape Brink is the only extra area found on Two Island outside of the main ferry area. There is not much to Cape Brink outside of the Wild Pokemon that can be found. However, there is a Move Tutor here that will teach your Final Evolution Starter Pokemon the Ultimate Elemental Attack if it has Max Happiness towards your trainer.
Frenzy Plant/Blast Burn/Hydro Cannon: Move Tutor Can Be Found In House
Wild Pokemon
Grasses:
Oddish(FireRed)/Bellsprout(LeafGreen) (30%): Levels 30-32
Spearow (20%): Level 31
Gloom(FireRed)/Weepinbell(LeafGreen) (15%): Levels 36-38
Fearow (10%): Level 36
Meowth (10%): Level 31
Persian (5%): Levels 37-40
Psyduck(FireRed)/Slowpoke(LeafGreen) (5%): Level 31
Golduck(FireRed)/Slowbro(LeafGreen) (5%): Levels 37-40
Surfing:
Psyduck(FireRed)/Slowpoke(LeafGreen) (95%): Levels 5-40
Golduck(FireRed)/Slowbro(LeafGreen) (5%): Levels 35-40
Magikarp (100%): Level 5
Poliwag (60%): Levels 5-15
Goldeen (20%): Levels 5-15
Magikarp (20%): Levels 5-15
Poliwag (40%): Levels 15-25
Poliwhirl (40%): Levels 20-30
Gyarados (15%): Levels 15-25
Psyduck(FireRed)/Slowpoke(LeafGreen) (5%): Levels 15-35
Items
Rare Candy: ItemFinder
PP Max: ItemFinder