Rock Tunnel イワヤマトンネル Unknown
Information about Rock Tunnel
Region:	Kanto
Connecting locations:	Route 10
Weather:	Normal
Kind:	Cave
Needed HM:	Flash
Generation(s) available:	I, II, III, and IV

Rock Tunnel is a passageway in the Kanto Region from Cerulean City to Lavender Town. In the Generation I games, it is the only way to progress at the time required to take it, due to a sleeping Snorlax on Route 12. Because of the dark, a Pokémon who can learn Flash is required to go into rock tunnel. The only way to learn flash is by receiving an HM05 from Prof. Oak's Aide near Diglett's cave.