Hello and welcome
You cannot currently get Hitmontop.
Here's a list of implemented pokes for future reference : [url="http://pokemmo.wikia.com/wiki/List_of_Available_Pok%C3%A9mon"]http://pokemmo.wikia.com/wiki/List_of_Available_Pok%C3%A9mon[/url]
Which you can also access by pressing H in game (the FAQ)
Feel free to message me anytime as well, or check Global Chat (my home).