Accepted answer

Just enable sharing for tooltip. And refresh both series's tooltip by giving the points of array that you want to show on the tooltip.

tooltip : {
          valueDecimals : 2,
          shared: true

xchart.tooltip.refresh([xchart.series[0].points[i], xchart.series[1].points[i]]);

And seems like showing two different tooltips without sharing is not possible through only api itself.

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