For kalki avtar it been said he will be trained by parshuram , 7 Chiranjeevi will assist him in restablishing dharma.
7 Chiranjeevi are
Lord Hanuman.
Mahabali ( grandson of prahlad )
Vedvyas
Kripacharya
Vibhishan
Ashwatthama
Parshuram
It is believed ashwatthama worships in badrinath. When in morning badrinath mandir is opened , it looked like someone already had done pooja of lord Vishnu. Badrinath is said to be another vaikuntha for lord Vishnu on earth where lord Vishnu is resting.
Some people say curse period of ashwatthama is over as he was only cursed for 3000 yrs of kaliyug, some says he will be alive till end of kalyug