you can find it at valley windworks
Mareep evolves into a Flaaffy, then an Ampharos.
After you get the National Dex it appears in Valley Windworks.
In Pokémon X and Y, you may find a horde of Mareep around Route 12.
In Pokémon Platinum, Mareep can be found using the PokéRadar in the grass patches of the Valley Windworks.
you can find it at valley windworks
It evolves from Flaaffy, which evolves from Mareep. Mareep is quite common early in the game.you cant you have to catch mareep and train it to level 30 then it evolves in to ampharos
Train mareep
vally windworks with pokeradar
trade it from silver, gold :(
Ampharos cannot be found in the wild. You must catch either a Flaffy or a Mareep and evolve that. (Level 30 from Mareep).
mareep can't be obtained in leafgreen but can be caught in emerald to trade it you need two wireless adapters and the national dex.
Mareep evolves into a Flaaffy, then an Ampharos.
Using the spiffy Pokéradar you got after the National Pokédex, scour the Valley Windworks for a Mareep. They're pretty rare (took me 10 minutes to find one), so bring lots of repels. After catching your Mareep (Quick Ball?), just evolve it from Mareep to Flaaffy to Ampirados.
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 :)
In Pokémon HeartGold, Flaaffy can be found at Routes 42 and 43. Additionally you can find and catch Mareep in Routes 33, 42 and 43 and the Safari Zone and then evolve Mareep at Level 15 which will cause Mareep to evolve into Flaaffy.
in the secret johto area.