Mareep locations — where to catch

In Lumiose City (Legends: Z-A)

• Wild Zone 1 — Walk

In Paldea (Scarlet & Violet)

• Area Zero — Walk
• South Province (Area Two) — Walk
• West Province (Area One) — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Valley Windworks — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Johto Safari Zone — Walk
• Route 32 — Walk
• Route 42 — Walk
• Route 43 — Walk
• Violet City — Gift

In Hoenn (Ruby, Sapphire & Emerald)

• Safari Zone — Walk

In Sevii Islands (FireRed & LeafGreen)

• Altering Cave — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Route 32 — Walk
• Route 42 — Walk
• Route 43 — Walk

Other games (8)

• Brilliant Diamond / Shining Pearl (Gen 8): Valley Windworks
• Ultra Sun / Ultra Moon (Gen 7): Paniola Ranch
• X / Y (Gen 6): Kalos Route 12
• Black 2 / White 2 (Gen 5): Floccesy Ranch
• Black / White (Gen 5): White Forest
• HeartGold / SoulSilver (Gen 4): Primo
• XD (Gen 3): Cipher Lab
• Colosseum (Gen 3): Phenac City

Mareep — full Pokédex entry