Is it possible to get G/S/C Pokemon that evolve from the original 151 in FR/LG?

Question

To give an example:
Could I get Crobat/Espeon/Umbreon or any other poekmon that evolve from the original 151 in FR/LG. P.S I am particularly interested in Eevee > Espeon. I've heard it's possible to get them in the Team Rocket post-game plot but I need to be sure.

Edit:
There has been some confusion. I want to know if you can evolve them and how/when to.

Answer 1

Yes it is possible, for every evolution EXCEPT for Espeon and Umbreon.

For the other evolutions (Crobat, Blissey, etc.) the method is the same as in GSC, except that they can't evolve until you can reach the Sevii Islands (I mean Four Island and beyond, not the first three). It will go to the evolution screen and then a message will appear telling you that it (can't evolve yet (I can't remember the exact message).

The reason you can't get Espeon or Umbreon is that FR/LG has no internal clock, so the game never knows whether it is day or night. The only way to get these two Pokemon in FireRed and LeafGreen is to hack the game or trade from RSE.

Unlike FR/LG, RSE does have an internal clock that is mostly used for growing berries and things (that's why you set the time at the start of the game), and so it can evolve Eevee in Espeon/Umbreon.

I hope this cleared things up a bit.

Answer 2

These are the eleven Pokemon from G/S/C that evolve from the original 151 from Kanto:
Crobat (Max Happiness on Golbat, and gaining a level)
Bellossom (Using Sun Stome on Gloom)
Espeon (Max Happiness with Eevee, level up during daytime)
Umbreon (Max Happiness with Eevee, level up during nighttime)
Slowking (Trading Slowpoke with a King's Rock)
Scizor (Trading Scyther with a Metal Coat)
Steelix (Trading Onix with a Metal Coat)
Kingdra (Trading Seadra with a Dragon Scale)
Blissey (Max Happiness with Chansey, gaining a level)
Porygon2 (Trading Porygon with a Up-grade)
Politoed (Trading Poliwhirl with a King's Rock)

If you meant in the wild, no none of these Pokemon are found in the wild. But they're pre-evolutions are, so you can always evolve these to get these Pokemon.

Here are their locations:

Golbat : Cerulean Cave, Icefall Cave, Lost Cave, Seafoam Islands

Gloom : Route 12, 13, 14, 15, Berry Forest, Bond Bridge, Cape Brink, Water Path

Poliwhirl : Route 6, 22, 23, 25, Cape Brink, Cerulean Cave, Four Island, Icefall Cave, Ruin Valley, Viridian City

Slowpoke : Route 4, 6, 10, 11, 12, 13, 19, 20, 21, 22, 23, 24, 25, Berry Forest, Bond Bridge, Canyon Entrance, Cape Brink, Celadon City, Cerulean Cave, Cerulean City, Cinnabar Island, Five Island, Five Isle Meadow, Four Island, Fuchsia City, Green Path, Icefall Cave, Kindle Road, Memorial Pillar, One Island, Outcast Island, Pallet Town, Resort Gorgeous, Ruin Valley, Seafoam Islands, Trainer Tower, Treasure Beach, Vermillion City, Viridian City, Water Labyrinth, Water Path (Wow -_-)

Onix : Rock Tunnel, Seavault Canyon

Chansey : Safari Zone Areas 2 & Center

Scyther : Safari Zone Areas 1 & Center (Only FireRed)

Eevee : Celadon City

Seadra : Bond Bridge, Cinnabar Island, Five Island, Five Isle Meadow, Green Path, Icefall Cave, Kindle Road, Memorial Pillar, One Island, Outcast Island, Pallet Town, Resort Gorgeous, Tanoby Ruins, Trainer Tower, Treasure Beach, Water Labyrinth, Water Path

Porygon : Celadon Game Corner 9999 Coins

EDIT : The Pokemon game will take you to the evolution screen, but it will seize evolving until you get the National Dex.

Source (Really you can shift between Crobat and any of the other said Pokemon for the fact.)

Hope I helped!

Comments

I played LG with an Espeon ;_; i guess m ROM was broken...

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I've played it with the original game, and though I have never tried myself to evolve an Espeon in the game, I DID try Crobat and that didn't work. I was feeling so annoyed that time >.<
That's why the source is a question which my attention had turned to when I was a freshman ;)

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FRLG is my favorite Pokemon game, and I used a Crobat on my 5th or 6th runthrough. It does start to evolve, and then it says "What the...? It stopped evolving!" or something along those lines.

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Exactly what it said to me ;-;
But this fixed after getting the National Dex.

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Yes. ^