Not sure but are those 2 not OU already?
Although I have never seen a Diglett vs me in NU I agree with KaynineXL. Diglett can trapp every special defensive wall besides Grumpig easily. Allowing a pokemon like Kadabra to sweep any thing once Diglett has done his job.
Doesn't it stop Victreebell's (That aren't Sunny day weatherball) aswell? Having the normal and grass resist + poison immunity. Doesn't a resisted signal beam from specs venomoth still do a lot?