Usually, the designated bitch is the Pokemon the developers use to help newbies coast through the start of the game until they can move on to the harder sections- sorta like "training wheels." These guys are Normal-types that evolve once and show up as one of, if not the first Pokemon you'll encounter in the wild- at a pathetic level 2 or 3. Bird Pokemon that show up early and often also fall prey to the HM Fly.
With stats embodying the very definition of "meh" and as useful as an ice pick in Hell, you'll basically give up on these Pokemon, label them the bastard child of the bunch, and saddle 'em with HMs on the spot. Seriously- who wants their Mewtwo or Regigigas stuck using a gay move like Rock Smash?? Screw that!
Each generation will have one lowly Normal-type:
Some have redeeming qualities, like Zigzagoon's Pickup. Expect more of these guys to add to the list beyond the writing of this definition.