Mareep evolves into Flaffy a Lv 15 then into Ampharos at Lv 30.
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It evolves when it reach level 15.
No, Mareep cannot evolve with the use of a Thunder Stone.
Mareep will not evolve at its evolution level or after it while in the possession of the Daycare however it will evolve once you take it out and level it up yourself. However you also have the option of watching the levels the Mareep grows and then taking it out once it reaches Level 14 so that you can level it to 15 so that it will evolve.
Mareep evolves into a Flaaffy at Level 15, which then evolves into Ampharos at Level 30.
No, Magneton cannot evolve in Pokémon HeartGold.