Ice, Electric and Ground have a super effective coverage of 505, a neutral coverage of 268, and no effect on Shedinja.
Stone and Ground are the two moves with the most coverage between them. Paired with Ice they have a neutral coverage of 283. and a Super Effective coverage of 491.
Following is Stone and Ground with Bug at 292 Neutral Coverage and 482 Super Effective.
Source: DB Type Coverage Checker
Thanks Dr Dude for rechecking that :p