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Z-Splash grants the user +3 Attack
Z-Destiny Bond forces all users to attack it
Dark Void accuracy 80% > 50%
Z-Geomancy, Z-Celebrate, Z-Happy Hour, Z-Hold Hands, and Z-Conversion raise all stats +1 stage.
Z-Belly Drum restores HP before deducting the 50%, so it can be used below 50% health
Z-Protect raises crit rate (only looked at data), Z-Detect raises evasion one level
Z-Parting Shot and Z-Memento also restore HP of the incoming Pokemon, no idea how much