I feel the best way to abuse Ononokusu is to take into account what your opponent's team is during the team preview stage and abuse this set;
Ononokusu @ Life Orb
Mold Breaker: Jolly
4 HP, 252 Attack, 252 Speed
Outrage
Earthquake
Swords Dance
Dragon Dance
It is not the most original set, but it can punch holes into any team that has a single pokemon below base 97 speed(likely). Taking into account your opponent's team and general playstyle, choose whether it's best to SD DD or just plain Outrage. Earthquake hits everything that resists it except Skarmory, but even he stands a great chance of being 2HKOed by an SDed outrage.
Edit: Goddamn 999 post. Now I have to make a warstory for my 1000th...
Ononokusu @ Life Orb
Mold Breaker: Jolly
4 HP, 252 Attack, 252 Speed
Outrage
Earthquake
Swords Dance
Dragon Dance
It is not the most original set, but it can punch holes into any team that has a single pokemon below base 97 speed(likely). Taking into account your opponent's team and general playstyle, choose whether it's best to SD DD or just plain Outrage. Earthquake hits everything that resists it except Skarmory, but even he stands a great chance of being 2HKOed by an SDed outrage.
Edit: Goddamn 999 post. Now I have to make a warstory for my 1000th...