he does not learn thundershock in any of the pokemon games.
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Mareep learns thundershock at level 10.But, I for one,would wait until it learns discharge(level 28)or thunder(level 46).
- Thundershock - Tailwhip - Quick Attack - Thunderbolt
Most electric types can learn flash like voltorb and magnemite.
voltorb pickachu manemite and so forth
Voltorb evolves in electrode at Lv. 30 =^)