Drull is the best attacking monster because of its high attack. But its weakness when attacking is Eye-ra. Its recommended to bring in the Zafreeti and make it faster using Putty Rage. When there's a High lvl Gorgo, Bring in the Zafs.
It's great for defending because it has fast speed and high damage,the only problem is Pokey-bomb,Gorgo can injured drull,Drull can't attack Flying Fomor. That's is the only problem.