Silver Trench

After rescuing Latias from Pitfall Valley, aim to recruit Articuno, Moltres, and Zapdos from their respective dungeons. (Frosty Forest, Mt. Blaze, and Mt. Thunder.) After doing both, visit either of the three in the Legendary Island Friend Area to obtain the Vortex Stone from Articuno. It will give you access to the Silver Trench, to find the guardian of the sea.

Inside the Dungeon

This is another 99 floor dungeon, and you need Dive to enter. Max Elixirs stop appearing at B20F, and Blue Gummis and Grimy Food stop at B30F. Bring extra food and elixirs, because of a large number of Grimy and PP-Zero Traps in the dungeon. Fixed monster houses appear on B15F, B35F, B55F and B75F, on the first room of the floor.

Wild Pokémon

	Floors	Levels	Recruit Rate
Vaporeon	20, 30, 40, 50, 60, 70, 80	22	Unrecruitable
Wingull	1-5	23	12.5%
Tentacool	1-8	25	8.3%
Shellder	1-9	20	12.2%
Omanyte	1-9	25	8.0%
Qwilfish	1-9	30	6.9%
Kabuto	5-13	28	7.2%
Corsola	5-13	27	8.3%
Slowpoke	6-14	25	12%
Seel	6-14	30	3.9%
Spheal	10-19	18	8.8%
Horsea	10-20	29	12.4%
Anorith	14-23	21	8.7%
Krabby	15-24	32	8.0%
Staryu	15-25	28	8.9%
Grimer	20-29	32	12.2%
Omastar	20-29	35	Unrecruitable
Kabutops	24-34	28	Unrecruitable
Sealeo	25-33	22	-19.0%
Kingler	26-35	35	Unrecruitable
Slowbro	30-36	27	Unrecruitable
Seadra	30-39	20	-19.0%
Carvanha	30-39	27	8.9%
Tentacruel	35-44	33	-30.0%
Starmie	35-44	22	Unrecruitable
Armaldo	35-44	28	Unrecruitable
Wailmer	41-50	35	8.2%
Luvdisc	45-54	30	8.6%
Dratini	50-59	30	11.0%
Slowking	50-59	38	Unrecruitable
Remoraid	50-59	21	8.8%
Dewgong	55-64	35	Unrecruitable
Muk	60-69	36	Unrecruitable
Octillery	60-69	30	-30.0%
Sharpedo	60-69	35	Unrecruitable
Walrein	60-69	28	Unrecruitable
Clamperl	65-79	35	8.5%
Chinchou	70-79	35	8.7%
Kingdra	70-79	40	Unrecruitable
Gorebyss	71-79	36	Unrecruitable
Cloyster	80-89	35	Unrecruitable
Lileep	80-89	40	7.3%
Relicanth	80-89	35	7.9%
Lanturn	90-98	45	Unrecruitable
Cradily	90-98	45	-30.0%
Huntail	90-98	30	Unrecruitable
Lugia	99	30	99.9% ^Boss

Lugia

On floor 99, you will find the guardian of the sea, Lugia.

Types:
Psychic	Flying

Ability:

Pressure

Held item:

None

Lugia Lv.30

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Lugia has a 99.9% recruitment rate, so be sure to have your team size down to two stars when you battle it.

Meteor Cave

After recruiting Lugia, Xatu will appear outside your team base. Soon after, Blastoise will come by, and talk about seeing "weird things" in a dungeon. Xatu names it Meteor Cave, because it was made from a chunk of the destroyed meteor. Xatu then gives you access to the cave.

Inside the Dungeon

This is a unique dungeon. Only one Pokémon can enter, and only three items can be brought, four if you bring a held item. The only Pokémon you will find is Deoxys. There is one on each floor, and you have to defeat it to unlock the stairs. It will be in either Attack, Speed, or Defense form. This continues for 20 floors, until the end. It is very useful to bring Iron Thorns/Silver Spikes/Sticks to the dungeon, throwing them will be able to defeat each Deoxys easily.