[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.