Seafoam Island & Articuno

Description Of Seafoam Island:
The next Legendary you can catch to help you out in the Pokemon League is Articuno, found at the bottom of Seafoam Island on Route 20. The cave is like a maze, and will require just about every HM Move you have. Articuno is a little difficult to find, but if you keep heading down within the cave, you'll soon get to the bottom of the cave where it lies.
First Floor:
Wild Pokemon:
Walking:
Seel - Level 30 - 25% Appearance Rate
Krabby - Levels 28-30 - 20% Appearance Rate
Staryu - Levels 28-30 - 19% Appearance Rate
Psyduck - Level 30 - 15% Appearance Rate
Zubay - Level 21 - 10% Appearance Rate
Slowpoke - Level 28 - 5% Appearance Rate
Golbat - Level 29 - 5% Appearance Rate
Slowbro - Level 38 - 1% Appearance Rate
Basement Floor #1:
Wild Pokemon:
Walking:
Krabby - Levels 30-32 - 25% Appearance Rate
Staryu - Level 30 - 25% Appearance Rate
Shellder - Level 30 - 15% Appearance Rate
Seel - Levels 28-30 - 15% Appearance Rate
Psyduck - Levels 28-30 - 15% Appearance Rate
Dewgong - Level 38 - 4% Appearance Rate
Kingler - Level 37 - 1% Appearance Rate
Basement Floor #2:
Wild Pokemon:
Walking:
Seel - Levels 30-32 - 40% Appearance Rate
Psyduck - Levels 30-32 - 25% Appearance Rate
Krabby - Levels 28-30 - 15% Appearance Rate
Shellder - Level 30 - 10% Appearance Rate
Staryu - Level 28 - 5% Appearance Rate
Golbat - Level 30 - 4% Appearance Rate
Golduck - Level 37 - 1% Appearance Rate
Basement Floor #3:
Wild Pokemon:
Walking:
Psyduck - Levels 31-33 - 40% Appearance Rate
Seel - Levels 31-33 - 25% Appearance Rate
Staryu - Levels 29-31 - 15% Appearance Rate
Krabby - Levels 29-31 - 15% Appearance Rate
Kingler - Level 39 - 4% Appearance Rate
Dewgong - Level 37 - 1% Appearance Rate
Old Rod:
Magikarp - Level 5 - 100% Appearance Rate
Good Rod:
Poliwag - Level 10 - 50% Appearance Rate
Goldeen - Level 10 - 50% Appearance Rate
Super Rod:
Shellder - Level 15 - 25% Appearance Rate
Goldeen - Level 15 - 25% Appearance Rate
Staryu - Level 15 - 25% Appearance Rate
Horsea - Level 15 - 25% Appearance Rate
Basement Floor #4:
Wild Pokemon:
Walking:
Krabby - Levels 31-33 - 40% Appearance Rate
Staryu - Levels 31-33 - 25% Appearance Rate
Psyduck - Levels 29-31 - 15% Appearance Rate
Seel - Levels 29-31 - 15% Appearance Rate
Golduck - Level 39 - 4% Appearance Rate
Golbat - Level 32 - 1% Appearance Rate
Old Rod:
Magikarp - Level 5 - 100% Appearance Rate
Good Rod:
Poliwag - Level 10 - 50% Appearance Rate
Goldeen - Level 10 - 50% Appearance Rate
Super Rod:
Shellder - Level 15 - 25% Appearance Rate
Goldeen - Level 15 - 25% Appearance Rate
Staryu - Level 15 - 25% Appearance Rate
Horsea - Level 15 - 25% Appearance Rate
At the end of cave on the fourth Basement Floor lies the Legendary Pokemon Articuno.

Articuno - Level 50 - Peck & Ice Beam