Five Island Is where things get Interesting. This Island is quite large and has many things:
Firstly It is home to Many Wild Pokémon Such as Sentret
It also houses the Rocket Headquarters that you cannot access until you have been to Islands 6 & 7
Inside are many Rocket Trainers, A Conveyer Belt Puzzle and the Scientist that steals the Sapphire Plate
To the North There is a Cave which has a door puzzle and many items
To the North-West you can go to a Man who will give you an egg which hatches into a Togepi
To the South there is a Rock Altar of which has a trainer in front mourning over their deceased Onix. Get them a drink and you get a TM

Hover to get area

Here are the Pokémon you will find in the wild on Five Island:

In The Grass
	Pidgey	Common Common
	Pidgeotto	Rare Rare
	Meowth	Common Common
	Persian	Rare Rare
	Sentret	Common Common
	Hoppip	Common Common
In The Cave
	Zubat	Common Common
	Golbat	Rare Rare
	Gastly	Common Common
	Haunter	Rare Rare
	Murkrow	Rare
	Misdreavus	Rare
In The Water
	Psyduck	Common
	Slowpoke	Common
	Shellder	Common
	Staryu	Common
	Tentacool	Common Common
	Krabby	Common Common
	Kingler	Rare Rare
	Gyarados	Rare Rare
	Hoppip	Common Common
	Qwilfish	Common
	Remoraid	Common

Thats all on Five Island...Click Here for Six Island