No, Mareep cannot evolve with the use of a Thunder Stone.
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Pikachu and Eevee both need a Thunder Stone to evolve.
the Pokemon that evolve with the help of a thunder stone are : pikachu +thunder stone = raichu, or eevee + thunder stone = jolteon.
You can't, it needs a Thunder Stone.
you have to use a thunder stone
Raichu does not evolve. Raichu is the combination of Pickachu and a thunder stone, and he does not evolve.