Pokemon Black and White has all new pokemon, and honestly, I'm not familiar enough with the game yet to tell you where you can find which pokemon. This is a problem, because I'm looking for a fast way to calculate Hidden Power in-game (I am aware that you can use IV calculators to determine what hidden power you have, but given the nature of IVs, you're outta luck for that method if your pokemon isn't already a reasonably high level and/or you've been keeping track of its EVs as well.)
Back in Emerald, for instance, I could reliably find Poochyena / Mightyena to test if Hidden Power was Psychic, Fighting/Bug, Dark/Ghost. I could then go find a Wurmple to determine if my Fighting/Bug result (super-effective against the Poochyena) was Fighting (also super-effective against the wurmple) or Bug (normal strength).
However, new version, new critters, my old plan no longer works; there aren't any poochyena in the game (or at least, not yet). Which common wild pokemon can I use to narrow down on the correct type of Hidden Power? (Assume I have access to Fly, and White, if it matters.)