Grassy Terrain halves the power of Earthquake, but not Earth Power. GZ4G-WWWW-WWW6-P9KH* Only the first three turns are important. Honedge survived the earthquake thanks to Grassy Terrain, Bellossom took less damage from Earthquake after Grassy Terrain was activated, and Earth Power dealt the same damage to Bellossom before and after Grassy Terrain was activated. Shoutouts to Fireworks for posting his Terrain research on NB Edit: Bulldoze and Magnitude have their power halved on Grassy Terrain as well. Drill Run and Dig do not. proof for Bulldoze and Drill Run: 8KPG-WWWW-WWW6-PARZ proof for Magnitude: BRDW-WWWW-WWW6-PAS5 Magnitude 6 would normally deal 11-13 damage to my Bellossom according to Showdown!'s damage calculator, but on Grassy Terrain, Bellossom only took 6 damage. 252 Atk Whiscash Earthquake vs. 252 HP / 100 Def Bellossom: 11-13 (6 - 7.1%) -- possibly the worst move ever (11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13) Magnitude isn't a listed move on that calc so I had to pick Earthquake and manually change its BP to 50.