[Solved]-How replicate the value of Y Axis on both sides of the axis in Highcharts-Highcharts

You still need to specify multiple axes, and then you can use the 'linkedTo' and 'opposite' properties:

 yAxis: [{
                min: 0,
                title: {
                    text: 'Population (millions)',
                    align: 'high'
                },
                labels: {
                    overflow: 'justify'
                }
            },{
                linkedTo:0,
                opposite:true
            }],

.

Edit for clarification based on comment below:

Highstock, at the time of this writing, sets the opposite property as true for the yAxis by default.

However, Highstock is not a "version of Highcharts". Highstock is its own product, originating from and related to Highcharts.

All versions of Highcharts currently set opposite to false both axes by default - yAxis will be on the left, and xAxis will be on the bottom.