Prior to completing Pokemon Brilliant Diamond and Pokemon Shining Pearl, trainers can find a mix of Pokemon from different regions in Sinnoh. Pokemon that aren't part of the Sinnoh Dex won't start appearing in the wild until after Brilliant Diamond and Shining Pearl'sstory has been completed. After this, it's possible to find Pokemon from Kanto, Johto, or Hoenn by using the Poke Radar, looking for Swarms, or exploring the Grand Underground.
Mareep and its evolutions aren't the most powerful Pokemon, but longtime fans may recognize it as a common trump card used against Violet City's gym leader, Falkner. Both Mareep and its evolution, Flaaffy, can be found in several locations in Brilliant Diamond and Shining Pearl. Fortunately, Mareep is not version-exclusive and doesn't require trading to reach its final evolution.
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If BDSP players haven't done so already, get the National Dex from Professor Rowan. If they're missing the Pokedex entry for Palkia (Brilliant Diamond) or Dialga (Shining Pearl), then visit Cynthia's grandma in Celestic Town and speak to her to register Pokemon no.149/150.
With all 150 Pokemon registered in the Sinnoh Dex (151 if counting Manaphy), visit Professor Rowan in Sandgem Town to get the National Dex and the Poke Radar. With both of these in hand, Mareep and the other National Dex Pokemon will start appearing in Sinnoh and the Grand Underground.
Mareep can't be found as a random encounter in the wild. Instead, it requires trainers to use the Poke Radaroutside the Valley Windworks. Mareep has a 12% chance of appearing and will be around level 8-9. If an Electric-type Pokemon has the Ability Static and is at the front of
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