Yea, the daycare would work. You may or may not experience error with the calculator if you only do it around level 20, but if you wanted to double-check, you could always do the Kecleon test or any other type check to see if it was right.
And yea, sorry, I ended up letting my sister on the computer and going to bed. Sure, add me to your friends list. I haven't really used that function, but I'll go ahead and add you too.
At any rate, if you want to do the IV check battle now, I'm ready if you are. But if you would rather do the daycare stuff, that would be fine too. As long as you level the Oddish without giving it EVs that could mess up your calculations (which means yea, don't use Exp. Share either). Although, you really could level normally, as long as you keep track of what EVs you get...