Pokémon FireRed and LeafGreen/Diglett's Cave

This underground cave connects Route 2 and Route 11. It's full of Diglett and Dugtrio. They both have an ability that doesn't allow you to escape from battle, so you might want to use Repel when you cross this cave.

Pokémon found

FireRed	Level	Encounter Rate	LeafGreen	Level	Encounter Rate
Diglett	15-22	95%	Diglett	15-22	95%
Dugtrio	29-31	5%	Dugtrio	29-31	5%

#50 Diglett
The first Ground-type Pokémon that you can catch in Pokémon FireRed. He is very useful against Electric-type Pokémon, but can be quite useless against flying ones. He is incredible fast but has a very little HP. He can learn many Ground type moves like Magnitude, Earthquake and Fissure.