Mistralton Cave

Mistralton Cave is a forgotten cave in Unova, said to be sealed with hints of a legend's presence. It is located at the northeast end of Route 6. To go there, you must surf past the water. There are three floors in the cave, with the top floor- the Guidance Chamber- being home to one of Unova's legendary Pokémon. As it is pitch-black inside, Flash is useful for exploring the area in detail.

When you get to the Guidance Chamber, an old man will approach you and tell the story of the "Musketeer Trio": in the distant past, when Pokémon and people lived separately, a war between humans caused an intense fire in a forest where many Pokémon lived. The Pokémon were in big trouble until Cobalion, Terrakion, and Virizion appeared and combined their skills to lead the Pokémon to safety. The three then stopped the war and disappeared

The old man explains that he's hunted the trio for decades and believes one of them is hidden in the cave. However, he also says that the trio are very distrustful of people and will attack if approached.

Guidance Chamber

Further on, in the northwest of the Guidance Chamber, Cobalion is waiting. After you capture it, it sees that people can be trusted and communicates this to Terrakion and Virizion, who release the seals of their hiding places in Pinwheel Forest and Victory Road.

Trainers

Trainer	Pokémon	Level
Hiker Hugh	Drilbur	33
	Gurdurr	33
Gain: 1056

Trainer	Pokémon	Level
Hiker Clarke	Boldore	34
Gain: 1088

Pokémon

Pokémon	Level	Rarity	How
Axew	30-31	Uncommon	Cave
Boldore	28-30	Common	Cave
Woobat	28-30	Uncommon	Cave
Drilbur	28-31	Common	Dust Cloud
Cobalion	42	One	Interact

Items

Item	How
Dusk Stone
Hard Stone
Hyper Potion x3	Two are hidden.
Iron
Rare Candy
Revive
TM80 Rock Slide
PP Up	Hidden.
Ultra Ball x2	Hidden.
Elixir	Hidden.
Dark Gem	Dust Cloud
Flying Gem	Dust Cloud
Ice Gem	Dust Cloud
Dragon Gem	Dust Cloud
Normal Gem	Dust Cloud
Ground Gem	Dust Cloud
Water Gem	Dust Cloud
Grass Gem	Dust Cloud
Fire Gem	Dust Cloud
Psychic Gem	Dust Cloud
Steel Gem	Dust Cloud
Ghost Gem	Dust Cloud
Bug Gem	Dust Cloud
Fighting Gem	Dust Cloud
Rock Gem	Dust Cloud
Electric Gem	Dust Cloud
Poison Gem	Dust Cloud
Everstone	Dust Cloud