After you beat the champion, the safari zone is then upgraded automatically. Go to the safari zone, there you'll see a path at rightside. Follow the path and you'll find mareep and many other Johto pokemon.
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You can catch Mareep in Altering Cave.Mareep is not available in firered you must trade one from emerald or colosseum.
yes you can but only in emerald after u beat the elite 4 and go to the area that's under construction
You can not catch it in leafgreen,but in firered you can.
Level 15. It evolves into Flaaffy.
You'll need to trade for it.