What are all the moves affected by Big Root?

Question

For Gen 8.

Answer 1

Damaging
- Absorb
- Drain Punch
- Draining Kiss
- Dream Eater
- Giga Drain
- Horn Leech
- Leech Life
- Mega Drain
- Oblivion Wing
- Parabolic Charge

Non-damaging
- Ingrain
- Aqua Ring
- Leech Seed
- Strength Sap

Source 1, Source 2

*I used Triage because it shows all the draining moves

Answer 2

Moves affected:

Offensive Moves: Absorb, Drain Punch, Draining Kiss, Dream Eater, Giga Drain, Horn Leech, Leech Life, Mega Drain, Oblivion Wing, Parabolic Charge, Strength Sap.
These all heal 30% more HP to the user with Big Root held.

Status Moves: Leech Seed, Aqua Ring, Ingrain.
These all restore 30% more HP per turn when active with the Big Root held.

Abilities: Liquid Ooze
With Big Root held, the holder takes 30% more damage from Liquid Ooze.

Source: Bulbapedia
Hope this helped!