What are all the moves that boost speed when used as a z-move?

Question

E.g. snatch

Answer 1

Other move effects, such as raising non-Speed stats, aren't mentioned. Assume all moves listed boost Speed by one stage unless stated otherwise.

After You
Ally Switch
Aurora Veil
Bestow (2 stages)
Celebrate
Conversion
Electric Terrain
Encore
Forest's Curse
Gastro Acid
Geomancy
Grass Whistle
Guard Split
Guard Swap
Hail
Happy Hour
Hold Hands
Hypnosis
Lock-On
Lovely Kiss
Me First (2 stages)
Power Split
Power Swap
Purify
Quash
Rain Dance
Recycle (2 stages)
Role Play
Safeguard
Sandstorm
Scary Face
Sing
Sketch
Skill Swap
Sleep Powder
Snatch
Speed Swap
Sticky Web
String Shot
Sunny Day
Supersonic
Switcheroo (2 stages)
Toxic Thread
Trick (2 stages)
Trick-or-Treat
Worry Seed
Yawn

Z-Moves (Bulbapedia)

Comments

Texhnically Extreme Evoboost and Clangorous Soulblaze do too, but I get the imporession the asker probably wasn't looking for exclusive z-moves, anyway.