Rock Tunnel

12 species to catch in 3 areas of this location, across 14 game versions.

Data from Pokemon HeartGold only: exact levels and the encounter rate for each Pokémon.

in tall grass

Conditional slots 8 for 8 species — time of day, weather, radio and other switches

The game keeps these slots separate from the base ones. Condition sets exclude each other (it cannot be morning and night at once), and the source does not say whether a condition adds a slot or replaces the whole table — so we list them row by row instead of adding them to the rate on the tile.

Pokémon	Conditions	Level	Rate
Machop	radio off	12	10%
Geodude	radio off	10–12	20%
Onix	radio off	16	10%
Cubone	radio off	10–12	20%
Makuhita	radio on Hoenn Sound	12–16	20%
Absol	radio on Hoenn Sound	10–12	20%
Chingling	radio on Sinnoh Sound	12–16	20%
Bronzor	radio on Sinnoh Sound	10–12	20%

by smashing rocks (Rock Smash)

The red marker is Rock Tunnel. A diagram, not a world map — distances are not to scale, but directions and connections match the game. The legend below the drawing explains each symbol.

• Route — number inside
• Sea route — Surf only
• City
• Pokémon League
• Interior — cave, forest, tower; placed next to its entrance
• Path between places
• Path that requires Surf
• Entrance to an interior — not a passage to the other side