He gives you one Kanto starter and(if i remember right) you can now go to Mt. Silver where Mewto resides and you can fight Ash, the hardest levelled trainer in the game(Pkmn Trainer Red)
get all 16 badges then talk to Prof. Oak
Deep in Mtt Silver. After obtaining all 16 badges and speaking to Prof. Oak.
You need to get all 16 badges and defeat red at the top of mt. silver. Then professor oak will call you.
Professor Oak gives you it after you get 16 badges
It is a item u can get from a prof that prof oak. it gives all six Pokemon in your team exp from the Pokemon you defeated
Prof. Oak gives it to you when you get all 16 badges.
you have to do prof. oak in bed then he gives you the Oak mail you have to battle prof. oak then he gives you the Oak mail
get all 16 badges then talk to Prof. Oak
HM08 Rock Climb (receive from Prof. Oak after obtaining 16 badges).
after you beat red[in mt silver] , go to prof oak and he will give you a Pokemon
prof. oak gives it to you i think
Once you have all 16 badges he will give you it in his lab
you need to get all 16 badges, then speak to prof. Oak- i think
Once you have finished all the gyms in Kanto and Johto including the elite four and champion, go to professor Oak's lab in Pallet Town, talk to professor Oak and he will give you the HM 08 Rock Climb.
You get it from Prof. Oak once you beat the elite four. (You do not need to do anything, Prof Oak takes you to his lab and gives it to you)
HM08 Rock Climb is given to you by Prof. Oak once you have all 16 badges.
Deep in Mtt Silver. After obtaining all 16 badges and speaking to Prof. Oak.