This Island has full of stuff:
Firstly, to the north is the Battle Tower
To the south is a Strength Puzzle that needs completeing
And further to the South are about 7 Ruins with Unown in them, but only if you do the above puzzle

Hover to get area

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

In The Grass
	Psyduck	Common
	Slowpoke	Common
	Spearow	Common Common
	Fearow	Rare Rare
	Meowth	Common Common
	Persian	Rare Rare
	Onix	Rare Rare
	Cubone	Common Common
	Marowak	Rare Rare
	Sentret	Common Common
	Skarmory	Rare
	Phanpy	Uncommon Uncommon
	Larvitar	Uncommon Uncommon
In The Water
	Tentacool	Common Common
	Tentacruel	Rare Rare
	Horsea	Common Common
	Seadra	Rare Rare
	Gyarados	Rare Rare
	Mantine	Rare
In The Ruins
	Unown	Common Common

Thats all on Seven Island - Click Here for Navel Rock