Other than what's already been mentioned, there are two moves that haven't been mentioned yet that I feel should be:
Incinerate - 30 power Fire-type attack that burns the opponent's berry. Even if you used that, they'd probably take just as much damage in the time that you knock them down to their berry. And 48 BP in the original Black and White? Really? Thankfully it was knocked down to only 6 BP in Black 2 and White 2, but it's still hardly worth anything. The only purpose this move serves is for those dang Pansear in Kilionea Road in PMD: Gates to Infinity to annoy the fudge out of you. (Interestingly, when I went through that dungeon, I found some Pansear, but didn't get hit with Incinerate once.)
Feint - Cited by Aquablade11 as the second most pointless move in the game (after Odor Sleuth and Foresight). In Generation IV, the fact that it only works if the foe uses Protect or Detect means that if you predict the opponent to do that, you'd be better off using, say, Swords Dance, or switching out, not using a weak, situational attack. In Generation V, it works even if the opponent doesn't do that, but it got weaker as a result.
Yep.