Information (include relevant logs, replays, screenshots): Stat increases from Z-Moves e.g. +1 Speed from Z-Sunny Day should not be affected by Contrary, but they are on the server. Spoiler Battle between Blinky and Lusamine started! Tier: SM UU Mode: Singles Rule: Unrated Rule: Sleep Clause Rule: Disallow Spects Rule: Species Clause Rule: Team Preview Rule: Self-KO Clause Your team: Claydol Opponent's team: Serperior Blinky sent out Claydol! Lusamine sent out Serperior! Start of turn 1 The foe's Serperior used Swords Dance! The foe's Serperior's Attack sharply fell! Claydol used Earthquake! It's not very effective... The foe's Serperior lost 14% of its health! Start of turn 2 The foe's Serperior surrounded itself with its Z-Power! The foe's Serperior used Z-Sunny Day! The foe's Serperior's Speed fell! The foe's Serperior used Sunny Day! The sunlight turned harsh! Claydol used Earthquake! It's not very effective... The foe's Serperior lost 16% of its health! The sunlight is strong. Lusamine forfeited against Blinky! (If applicable) Sources to confirm the presence of a bug (ex. Smogon): Confirmed with in-game testing.
Stat stage increases caused by the Z-Power effects of status Z-Moves are not modified by Simple/Contrary, but the stat change effect of the original move will be modified by Simple/Contrary (e.g. Z-Geomancy). Also, special reminder that the stat stage increases from Extreme Evoboost are modified by Simple/Contrary.