There is no moves that can poison the user. Toxic Orb is the only efficient way to poison the user, without really taking away any valuable turns.
By that I mean, if you're doing doubles for instance, your teammate can poison you with Toxic, inflicting the poison, or if you poison your teammate with the ability Synchronize, you will receive it too. However, you can see here that this will take away one of your moves, whereas Toxic Orb will just activate immediately after the first turn (however, you are prone to being hit by Knock Off or maybe by Switcheroo - but even this is very unlikely). So, Toxic Orb would be the best thing for you to hold if your objective is to poison the user.
Hope I helped! :)