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One of the problems with coming up with signature moves is how Smeargle can also utilise them, sometimes to better effect since it can also run three other moves tailored to exploit it to the max. That, and there's already a plethora of moves, so adding a new move for hundreds of shitmons would just expand that list further. Thus, I'm becoming more and more sold on the idea of making signature moves intrinsic, where the moves can still be found on plenty of mons, but its effect varies depending on which mon using it. For instance:
>Lava Plume
If Magcargo uses it, burn chance increased to 80%.
>Poison Fang
If Crobat uses it, 50% of the damage is recovered as HP.
>Slack Off
Can also be used during Slaking's Truant turns.
>Shadow Punch
If Golurk uses it, bp increased to 90.