How to make datapump apply directly to the destination schema
Using Network Link Import to Move Data


  When the Import NETWORK_LINK parameter is used to specify a network
  link for an import operation, SQL is used to move the data using an
  INSERT SELECT statement. The SELECT clause retrieves the data from the
  remote database over the network link. The INSERT clause uses SQL to
  insert the data into the target database. There are no dump files
  involved.


NETWORK_LINK