So today I was in the Battle Tower in Pearl when my opponent's Gligar used Dig. I switched to Torterra, since it's four times resistent, and also happens to know EQ. But then I wondered; normally Gligar is immune to ground attacks since it's part flying. But EQ hits Pokemon that are using Dig. Would an EQ on a Gligar that's in the midst of using Dig have any effect? Or is it still immune?