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Learn until the ghostie gets access to Shadow Ball.
I think I've only seen the boost happen for me once or twice in all the times I used it. It's good enough to pick up, but not good enough to keep once better Ghost moves come along for the Pokemon that has it.
Enjoy using it early game, but sometimes I had also managed to use Outrage 5-6 times without getting hurt from confusion, so I might forget it later on