Wait till after his first move. If Rock Tomb lands use String Shot to hold the rocks together and create a protective tomb to protect yourself from his next attack. If Rock Tomb misses use Bug Buzz.
If you were able to build the rock tomb wait until after Stone Edge has been used and then use Toxic. If you weren't able to make the shield use the speed of Aerial Ace to try and dodge the rocks before you attack.
Decided to try something interesting...
String Shot/Silver Wind ~ Toxic/Aerial Ace