Question

Are there any Electric type attacks that hit everyone on the screen?

Answer 1

All
Electric Terrain
Ion Deluge

All adjacent
Discharge
Parabolic Charge

All adjacent foes
Electroweb
Overdrive
Wildbolt Storm

All allies
Magnetic Flux

Of these, all except Electric Terrain, Ion Deluge, and Magnetic Flux do damage.

Moves that hit multiple Pokémon (Pokemon Database)

Answer 2

Currently there are two:

• Discharge - hits all Pokemon including allies (in triple battles it only hits adjacent Pokemon, not ones on the far side)
• Electroweb - hits both opponent Pokemon (adjacent in triple battles)

See Multi-target moves for a full list.