that was the OU belly drum set on the showdown website with 92 points in hp, dno anything bout azumarril so i just stuck to the default sets.
and even with 252 investment its 0 Atk Life Orb Protean Greninja Gunk Shot vs. 252 HP / 0 Def Azumarill: 390-460 (96.5 - 113.8%) -- 75% chance to OHKO
with a few points in attack you can easily get that to a certain 1HKO hers the min to 1HKo azumarril if it goes max hp
40 Atk Life Orb Protean Greninja Gunk Shot vs. 252 HP / 0 Def Azumarill: 406-478 (100.4 - 118.3%) -- guaranteed OHKO
again hasty nature in all cases
and even with 252 investment its 0 Atk Life Orb Protean Greninja Gunk Shot vs. 252 HP / 0 Def Azumarill: 390-460 (96.5 - 113.8%) -- 75% chance to OHKO
with a few points in attack you can easily get that to a certain 1HKO hers the min to 1HKo azumarril if it goes max hp
40 Atk Life Orb Protean Greninja Gunk Shot vs. 252 HP / 0 Def Azumarill: 406-478 (100.4 - 118.3%) -- guaranteed OHKO
again hasty nature in all cases