Union Cave

Union Cave is a cave in Johto linking Route 32 and Azalea Town. One Lapras can be found during Fridays at night, and a new one appears every Friday.

Wild Pokémon

Pokémon	Level	Rate	Version	How
Sandshrew	6	30%	Gold, Sliver, Crystal, HeartGold	Walking
Geodude	6	30%	Gold, Sliver, Crystal, HeartGold and SoulSliver	Walking
Zubat	5-7	75% (Heart Gold and Soul Silver) 25% Gold and Silver	Gold HeartGold and SoulSliver	Walking
Rattata	4-6	10% (Pokemon HeartGold and Gold) 25%	HeartGold SoulSliver	Walking
Buizel	25	25%	Heartgold	Grass (Sinnoh Sound)
Wurmple	23	25%	HeartGold SoulSliver	Grass (Hoenn Sound)
Hoothoot	24	50%	Heartgold SoulSliver	Headbutt Trees
Tangela	3-7	50%	Heartgold SoulSliver	Headbutt Trees
Tentacool	10-20	75% (Super Rod) 50% (Old Rod)	HeartGold SoulSliver	Fishing with Old or Good Rod, Surf
Quagsire	25	50%	HeartGold SoulSliver	Surf
Lapras	30	Once per week	HeartGold SoulSliver	Talking to it on BF3

Map

Trainers

v · d · eJohto
Cites
Cherrygrove City · Violet City · Goldenrod City · Ecruteak City · Olivine City · Cianwood City · Blackthorn City Frontier Access HGSS · Safari Zone Gate HGSS
Towns
New Bark Town · Azalea Town · Mahogany Town
Pokémon League
Indigo Plateau
Routes
29 · 30 · 31 · 32 · 33 · 34 · 35 · 36 · 37 · 38 39 · 40 · 41 · 42 · 43 · 44 · 45 · 46 · 47 HGSS · 48 HGSS
Caves, Tunnels and Mountains
Dark Cave · Union Cave · Slowpoke Well · Mt. Mortar · Whirl Islands · Ice Path · Dragon's Den · Mt. Silver · Cliff Cave HGSS · Sinjoh Ruins HGSS
Forests
Ilex Forest
Places of Interest
Sprout Tower · Ruins of Alph · Goldenrod Radio Station · Goldenrod Department Store · National Park · Bell Tower Burned Tower · Glitter Lighthouse · S.S. Aqua · Lake of Rage · Team Rocket HQ · Battle Tower C · Battle Frontier HGSS Cliff Edge Gate HGSS · Embedded Tower HGSS · Pokéathlon Dome HGSS · Safari Zone HGSS
Other regions: Kanto (Sevii Islands) · Johto · Hoenn · Sinnoh (Battle Zone) · Unova · Kalos · Alola · Galar (Isle of Armor · Crown Tundra)