If you don't mind me asking, what exactly do you need to input that doesn't already exist...?Does anyone have a link to an IV calculator that lets you input base stats? I cannot for the life of me find one. They all just use existing pokemon to calculate IVs.
That said, MetalKid, Serebii, and Psypokes (the three IV calcs I can think of) all use existing Pokemon and there's no way to really edit them.