Charmander
Go to the guy above the Nugget Bridge and he will give you Charmander.

Squirtle
Beat Lt. Surge and go to the Officer Jenny in the middle of Vermilion city and she will give you Squirtle but only if you have beaten Lt. Surge.

Pikachu Surfing Game
Before you play the Surfing Pikachu game you have to have a Surfing Pikachu.If you do not have a Surfing Pikachu you need either Pokémon Stadium for N64 or a Gameshark.
To get Surfing Pikachu from Pokémon Stadium you have to beat the stadium mode without using rental Pokémon and you will get a Surfing Pikachu.
To get Surfing from your Gameboy Gameshark you have to have a Pikachu in the first slot of your lineup.Put this code in:
013972D1
013973D1
013974D1
013975D1
This will not glitch the game if you set the switch to normal and turn it to on after the game starts.Now go to the little house at the bottom of Fushia City.

When and where will Jessie and James appear?
Mt. Moon (before you exit)
Celadon game corner (Before you meet Giovanni)
Pokemon tower, Lavender Town (After you beat the Marowak)
Sliph Co. (Before you meet Giovanni again)