It evolves at level 20 if the Attack and Defense stats are the same.
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You get a Hitmontop by evolving a Tyrogue. Tyrogue evolves on lv20 into Hitmontop by it having high speed and it should evolve into a Hitmontop.
To get a Hitmontop in Pokemon Heart Gold, firstly you must get a Tyrogue, then it will evolve at level 20 into a Hitmontop, though Tyrogue Attack and Defence stats must be equal, if one of the other are not equal, Tyrogue will either evolve into a Hitmonlee or a Hitmonchan. Jacko25
you evolve tyrogue with its attack and defense equal to each other.
At level 20 when attack and defense are equal
Hitmonchan does not have anything to evolve into. It pre-evolution is Tyrogue and depending on stats it will evolve into Hitmonchan or Hitmontop.