Last submissions? Lets go!
Poliwrath crest: sheer force and can hit water pokemon always neutral
Politoed crest: drizzle is now Primordial Sea, but only as long as Politoed is in the fight
(H)Linoone/Mightyena Crest: Paralyse Linoone/Mightyene and when defeating a pokemon its attack rises +1 (moxie), and can not be paralysed. Losing/Changing or switching neutral typings against Linoone/Mightyena would be awasome aswell
Bojilin crest: Ice moves have priority and water attacks have +10% chance of flinching
Kapardor Crest: Splash has a 1% Chanc