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Clangorous Soulblaze is a species-exclusive Z-Move that can:
a) Hit both opponents in Doubles, and
b) Raise Kommo-o's five stats by a single stage.
Meanwhile, most other species-exclusive Z-Moves don't have additional effects. The only exceptions are Alolan Raichu's Stoked Sparksurfer (which paralyzes an opponent that it hits if it can) and Mew's Genesis Supernova (which sets up a Psychic Terrain), and 10,000,000 Volt Thunderbolt (which has a sharply increased critical hit ratio). Eevee's Z-Move Extreme Evoboost doesn't count, as the boost is the only element of this move.
Sinister Arrow Raid, Malicious Moonsault, Oceanic Operetta, Catastropika, Guardian of Alola, Pulverizing Pancake, Soul-Stealing 7-Star Strike... None of those moves have additional effects.
It's disgusting how Game Freak decided only now that species-exclusive Z-Moves should have an additional effect. They won't retcon the moves without effects so unfortunately we won't get anything like Decidueye getting a stat boost when it uses Sinister Arrow Raid.
This sucks.
