Samurott Crest gives a boost to cutting moves by 33% and increases base speed by 25%.
Octillery crest- Speed scales with lowering attacking stat. SE Moves do 1.25% more dmg
Emboar Crest- gives weight based moves a 1.3 power boost.
Flygon Crest-Sound based moves get a 1.3 power boost and /swaps attack with speical attack and becomes a Bug/Dragon type.
Noctowl Crest-Psychic moves hit with STAB and speed is increased by 1.2%
Huntail Crest- contact moves power increase by 1.2 times and dark type moves get stab
Gorebyss- same a