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it doubles the chances of added effects. so jirachi's thunder will have 60% chance of paralyzing, or ancient power has a 20% chance of upping stats, as opposed to 30% and 10% respectively.
And other Pokemon can have the ability, too. Like Blissey and Dunsparce. So it's not just a legendary-exclisive albility, like Drought with Groudon or Air Lock with Rayquaza.