Dragon Claw / Earthquake gives you good coverage, so you can try Fire Blast as a Skarmory can wall your and Roar your DDs off. Fire Blast also helps against Forretress.
Maybe you can try Roar over Rest on Swampert as you don't have a phazer. Then, choose between Surf / Ice Beam.
Sing's got sickening accuracy, so you can try Aromathrapy/ Thunder Wave in that slot. Use Aromatherapy if you use Rest on Swampert to heal it off.
You can also try Ice Beam/ Seismic Toss/ Wish/ Protect to help your team with wishes all round ^^
Maybe you can try Roar over Rest on Swampert as you don't have a phazer. Then, choose between Surf / Ice Beam.
Sing's got sickening accuracy, so you can try Aromathrapy/ Thunder Wave in that slot. Use Aromatherapy if you use Rest on Swampert to heal it off.
You can also try Ice Beam/ Seismic Toss/ Wish/ Protect to help your team with wishes all round ^^