In Pokémon X and Y, you may find a horde of Mareep around Route 12.
you can find it at valley windworks
Mareep evolves into a Flaaffy, then an Ampharos.
you cant catch it in gold if its a boy you can catch it in blue if its a girl you can catch it in purple
You cant.
you cheat
You can't catch Flaafy, but you can catch Mareep at the Valley Windworks.
You can either catch a mareep, breed a mareep, trade a mareep or go to the global trade station and ask 4 a mareep/ Ampharos :)
catch a mareep and train it
you can't
You can not catch it in leafgreen,but in firered you can.
in the game
The Kanto or Johto region.
trade
Nowhere.
trade him
you can catch mareep in vallyworks using the pokeradarmareep is by floaroma city, in the grass by the valleyworks. use a pokéradar, and if the grass is shaking, and is shining, go into that patch of grass, because it's more likely mareep is there. mareep isn't hard to find, but will only be a level 6-10. Mareep is easy to catch aswell. Hoped i helped:P pokefan_booo
you can find it at valley windworks