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Yeah, I tend to mix up those two D:
I only need Outrage on Gible, Stealth Rock on Shieldon and Head Smash on Archen, so you can overwrite any of the others.
Just checked and I don't have any Chikorita spitbacks ready, but since that Chikorita obviously doesn't have the HA, I'll just quickly breed you any female spitback...
From my experience that isn't always as quick as one would think! I don't know how viable they are in VGC, but would you be interested in Dive Nidoran, Repeat Gible or Timer Axew spitbacks?