Question

Where in:

Gold
Silver
Crystal

FireRed
LeafGreen
Ruby
Sapphire
Emerald

Diamond
Pearl
Platinum
HeartGold
SoulSilver

Black
White
Black2
White2

I know there's not in the 1st generation games, as there is no need.

Answer 1

Goldenrod City: A woman in the house northeast of the Bike Shop will rate a Pokémon's friendship.
Goldenrod Department Store: On Sundays only, a woman at the TM Corner, on the fifth floor, gives away either TM27 (Return) (friendship above 150) or TM21 (Frustration) (friendship below 100).
Verdanturf Town: A woman in the house in the south-western part of town will rate a Pokémon's friendship.
Pacifidlog Town: Once every week, a man gives away either TM27 (Return) (friendship above 150) or TM21 (Frustration) (friendship below 100).
Pallet Town: At Blue's house, Daisy will rate a Pokémon's friendship.FRLG
Hearthome City: An NPC rates friendship in the Pokémon Fan Club.
Route 213: At the Footstep House, Dr. Footstep will rate a Pokémon's friendship, albeit in a roundabout way which differs among Pokémon species.
Eterna City: A woman who gives the player the Pokétch App, Friendship Checker, will rate the friendship of the player's Pokémon.
Icirrus City: At the Pokémon Fan Club, a member there will rate a Pokémon's friendship.
Nacrene City: A woman in the building to the right of the Pokémon Center with a CottoneeB/PetililW will rate a Pokémon's friendship.
In addition, the Pokétch's Friendship Checker App will display a Pokémon's friendship on a scale of one to two small or big hearts. If the Pokémon has a low friendship value, then it will move away from the point where the Nintendo DS screen is touched.
Finally, in Pokémon Black and White 2, once the player has registered Bianca in the Xtransceiver, they may call her at any time to evaluate the friendship of any Pokémon in their current party.

Source