Q:

Show chapter* in parttoc but not main toc

MWE:
\documentclass[a4paper,oneside]{scrbook}
\usepackage{minitoc}
\setcounter{tocdepth}{0} 

\begin{document}
\doparttoc
\tableofcontents

\part{Part 1}
\parttoc
\addstarredchapter{Chapter}
\chapter*{Chapter}
\chapter{Chapter 1}
\chapter{Chapter 2}

\part{Part 2}
\parttoc
\addstarredchapter{Chapter}
\chapter*{Chapter}
\chapter{Chapter 3}
\chapter{Chapter 4}

\end{document}

Currently the TOC looks like this:

What I want it to look like is:

Without loosing it in \parttoc as in the following image:

I don't want to use titletoc as suggested here.

A:

You can use the mtchideinmaintoc environment to hide information in the main ToC:
\documentclass[a4paper,oneside]{scrbook}
\usepackage{minitoc}
\setcounter{tocdepth}{0} 

\begin{document}
\doparttoc
\tableofcontents

\part{Part 1}
\parttoc
\begin{mtchideinmaintoc}
\addstarredchapter{Chapter}
\chapter*{Chapter}
\end{mtchideinmaintoc}
\chapter{Chapter 1}
\chapter{Chapter 2}

\part{Part 2}
\parttoc
\begin{mtchideinmaintoc}
\addstarredchapter{Chapter}
\chapter*{Chapter}
\end{mtchideinmaintoc}
\chapter{Chapter 3}
\chapter{Chapter 4}

\end{document}

The main ToC:

An image of one of the partial ToCs:

One can define a command to do this in a more succinct way:
\documentclass[a4paper,oneside]{scrbook}
\usepackage{minitoc}
\setcounter{tocdepth}{0} 

\newcommand\Mychapter[1]{%
\begin{mtchideinmaintoc}
\addstarredchapter{#1}
\chapter*{#1}
\end{mtchideinmaintoc}}

\begin{document}
\doparttoc
\tableofcontents

\part{Part 1}
\parttoc
\Mychapter{Chapter}
\chapter{Chapter 1}
\chapter{Chapter 2}

\part{Part 2}
\parttoc
\Mychapter{Chapter}
\chapter{Chapter 3}
\chapter{Chapter 4}

\end{document}

Of course, one could also make this redefinition for the internal command \@schapter (in charge of starred chapters); but this might have undesired side-effects since internally \chapter* is used for several document units (ToC, LoF, LoT, bibliographies, indexes):
\documentclass[a4paper,oneside]{scrbook}
\usepackage{minitoc}
\setcounter{tocdepth}{0} 

\makeatletter
\renewcommand*{\@schapter}[1]{%
\begin{mtchideinmaintoc}
\addstarredchapter{#1}
  \if@twocolumn
    \if@at@twocolumn
      \@makeschapterhead{#1}%
    \else
      \@topnewpage[\@makeschapterhead{#1}]%
    \fi
  \else
    \@makeschapterhead{#1}%
    \@afterheading
  \fi
\end{mtchideinmaintoc}
}
\makeatother

\begin{document}
\doparttoc
\tableofcontents

\part{Part 1}
\parttoc
\chapter*{Chapter}
\chapter{Chapter 1}
\chapter{Chapter 2}

\part{Part 2}
\parttoc
\chapter*{Chapter}
\chapter{Chapter 3}
\chapter{Chapter 4}

\end{document}

