As for the Juvenile in question, according to the Section 6(1) of Juvenile Justice Act, (Care and Protection of Children), 2015.
Any person who has completed 18 years of age, and is apprehended for committing an offence when he was below the age of 18 years, then such person shall, subject to the provisions of this section, be treated as a child during the process of inquiry. Thus, that juvenile will be tried according to the rules of Juvenile Justice Board.
For that what you have to do is, get a FIR registered in his name in the nearest police station having jurisdiction over that area where the offence was committed, and then go on with the proceedings in the Juvenile Court.
Section 354 in The Indian Penal Code
Assault or criminal force to woman with intent to outrage her modesty.ÑWhoever assaults or uses criminal force to any woman, intending to outrage or knowing it to be likely that he will thereby outrage her modesty, shall be punished with impris_onment of either description for a term which may extend to two years, or with fine, or with both.
the Indian Penal Code being a colonial law did not include stalking as a criminal offense.
Protection to women was only given under Section 354 of the IPC for sexual harassment and Section 509 for insulting the modesty of a woman.
Reference: Section 354 of Indian Penal Code
Section 6(1) of Juvenile Justice Act, (Care and Protection of Children), 2015