After you beat Erika, you can beat the Rocket Hideout if you haven't already. That's located in the Game Corner, which is a little ways southward from where you came from (which is from the underground road) It's essential to go there, since you'll get the silph scope to identify ghost type Pokemon in the Pokemon Tower in Lavendar Town to save Mr. Fuji and get the Poke Flute to wake up the duo Snorlax blocking your way on Route 12/13 and on the Bike Route west of Celadon, so you can advance to Fuschia.
You have to beat the first 3 gyms in Kanto before Erika will be in her gym. Erika's gym is the fourth in the series.
beat erika, fourth (celadon) gym leader, who uses grass Pokemon
beat the champion and deafeat N the leader of team plasma
battle as hard as you can Lavaridge town
No stupid it's imposible
To beat the Pokemon Leaf Green version for Gameboy you have to get the Nation Dex and beat Raiku and Suicune.
You have to beat the first 3 gyms in Kanto before Erika will be in her gym. Erika's gym is the fourth in the series.
you need to catch it first in fire red/ leaf green and migrate it to pearl after you beat the Pokemon league.
beat erika, fourth (celadon) gym leader, who uses grass Pokemon
You have to defeat Erika.
You have to beat Erika, who is the fourth Gym Leader, raises Grass-Type Pokemon, and resides in Celadon City.
Finish your Pokedex And Beat The Elite Four once then the second time they have stronger Pokemon
beat the champion and deafeat N the leader of team plasma
after you beat the elite 4 you should automatically get it if not see professor oak
you fill your pokedex
battle as hard as you can Lavaridge town
after beating alder and seeing or catching all Pokemon