Ghost + Fighting = Perfect coverage.
Dark + Fighting = Resisted by Heracross and Toxicroak.
Both Shadow Ball and Dark Pulse have the same damage, the only differences are the effects and a single type they are resisted by.(Normal and Fighting respectively)
I would go for Shadow Ball as you wouldn't want to increase a Cobaluon's Attack as he switches in on you or heck, even another Lucario.
Also, without SB or DP, killing ghosts might be troublesome.
For example, Chandelure(they'll end up in the same tier at this rate, won't they?) takes 49.43% - 58.24% from a LO Dragon pulse, but takes 87.36% - 103.45% from that LO Shadow Ball.
Dark + Fighting = Resisted by Heracross and Toxicroak.
Both Shadow Ball and Dark Pulse have the same damage, the only differences are the effects and a single type they are resisted by.(Normal and Fighting respectively)
I would go for Shadow Ball as you wouldn't want to increase a Cobaluon's Attack as he switches in on you or heck, even another Lucario.
Also, without SB or DP, killing ghosts might be troublesome.
For example, Chandelure(they'll end up in the same tier at this rate, won't they?) takes 49.43% - 58.24% from a LO Dragon pulse, but takes 87.36% - 103.45% from that LO Shadow Ball.