  This paper deals with the problem of defining off-shell conserved charges in
a set of theories known as Chern-Simons-like theories of gravity (CSLTG). The
method is derived in a general way, which may find applications in a wide set
of theories, and then specified to the case of Generalized minimal massive
gravity (GMMG), where known results of the central charge and black hole
entropy are reproduced. The results for the charges are useful to the community
and can be applied to all three-dimensional gravity theories within the class
of CSLTG which includes almost all of them. The given specific examples show a
consistency check of the more general method.
