Question

What Pokémon should I use with Mareep in Silver to get him with the egg move Thunderbolt?

Answer 1

These are all the compatible fathers that can learn thunderbolt without having to trade or transfer from another game.
Learns thunderbolt by level up: the thing that evolves into Raichu, Raichu
Learns thunderbolt by sketch: Smeargle
Learns thunderbolt by egg move: Mareep, Flaafy, Ampharos
source

Comments

Elekid and Electabuzz can't Breed with the Mareep line

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Edited!