The following moves have hit multiple foes, according to this on the database
- Acid
- Air Cutter
- Blizzard
- Breaking Swipe
- Bubble
- Captivate
- Clanging Scales
- Clangorous Soulblaze (This and the previous one are Kommo-o exclusive)
- Core Enforcer (Zygarde exclusive)
- Dark Void (Darkrai exclusive)
- Dazzling Gleam
- Diamond Storm (Diance exclusive)
- Electroweb
- Eruption
- Glaciate (Kyurem exclusive)
- Growl
- Heat Wave
- Hyper Voice
- Icy Wind
- Incinerate
- Leer
- Muddy Water
- Origin Pulse (Kyogre exclusive)
- Poison Gas
- Powder Snow
- Precipice Blades (Groudon exclusive)
- Razor Leaf
- Razor Wind
- Relic Song (Meloetta exclusive)
- Rock Slide
- Shell Trap (Turtonator exclusive)
- Snarl
- String Shot
- Struggle Bug
- Sweet Scent
- Swift
- Tail Whip
- Thousand Arrows (Zygarde exclusive)
- Thousand Waves (Zygarde exclusive)
- Twister
- Water Spout
Actually, there are a few more, that target all foes, even in triple battles:
- Heal Block
- Imprison
- Spikes
- Stealth Rock
- Sticky Web
- Toxic Spikes
These are all status moves.
And there it is :)