Once you have evolved the Tyrogue into a Hitmonchan, you can give it EV reducing berries to reset its EVs to the amount you want.
EV-reducing berries
There are also a set of berries that will reduce your Pokemon's EVs. They are useful if you miscount EVs or simply want to change the EV distribution. All the berries can be obtained from the Berry Master on Route 208:
#21 Pomeg Berry (HP)
#22 Kelpsy Berry (Attack)
#23 Qualot Berry (Defense)
#24 Hondew Berry (Sp. Attack)
#25 Grepa Berry (Sp. Defense)
#26 Tamato Berry (Speed)
If you have over 100 EVs in a stat, the first berry will reduce them to 100, while further berries will decrease the EVs by 10. Therefore if you want to remove all EVs you will need 11 berries for the stat.
-From this site