Walkthrough
With Team Rocket defeated in Icefall Cave, the next thing to do is head to Five Island. This location is full of many different areas, including Five Isle Meadow (east of main area), Memorial Pillar (east of Five Isle Meadow), Water Labyrinth (north of main area), Resort Gorgeous (north of the Water Labyrinth), and Lost Cave (accessed in Resort Gorgeous). Team Rocket's Warehouse can also be found on Five Isle Meadow.
Wild Pokemon
Surfing:
Tentacool (65%): Levels 5-40
Hoppip (30%): Levels 5-15
Tentacruel (5%): Levels 35-40
Magikarp (100%): Level 5
Horsea(FireRed)/Krabby(LeafGreen) (80%): Levels 5-15
Magikarp (20%): Levels 5-15
Horsea(FireRed)/Krabby(LeafGreen) (40%): Levels 15-25
Shellder(FireRed)/Staryu(LeafGreen) (40%): Levels 15-25
Gyarados (15%): Levels 15-25
Seadra(FireRed)/Kingler(LeafGreen) (4%): Levels 25-35
Psyduck(FireRed)/Slowpoke(LeafGreen) (1%): Levels 25-35
Items
Max Potion: On Ground