Let's say a Garchomp knows Hone Claws and Dragon Rush. If it uses Hone Claws, it raises Attack and Accuracy stat. Dragon Rush has a base accuracy of 75. How much more accurate will the move be now? 80? 90? 100? Thanks.
When you increase accuracy by one stage it increases by 33.33% meaning that when you use dragon rush after a boost, your chance of hitting will increase from 75 to 99.75(approximately, but this is the best estimate there is)
Tested on showdown