Just try using vitamins (specifically Iron and Protein in this case) and you can always save before evolving it, then try and evolve it. If it does not evolve into Hitmontop, you can reset, add more into the stats and try again. Hope that helped you.
Thanks. If I evolve it using an EXP Share and having it in my party, but not fighting any actual pokemon with it, will it affect any stat increases from EVs?