After beating Blue you go to Professor Oak's lab in Pallet Town.
To Blackthorn City.
Go to the Radio Tower in Goldenrod City.
The last gym is in viridian city
in mount silver after you have beaten every gym leader
you have to go to azalea town and beat the second gym leader, Bugsy.
"go home" is what she says
in mohgaony town
Blue, the last gym leader in kanto region
beat the last gym leader on soul silver in johto
I'm guessing you have to defeat all 16 gym leader's before you attempt that...
go to the guy that sells rage candy
go to the last city you gone to