Memento can be deadly if your enemy doesn't expect it.
I mean, you're forcing a physical attacker to switch, so, if you're using Charizard, you can use Substitute, then Belly Drum, then you get Salac Berry's speed boost, and you sweep. You also have a free turn to use Dragon Dance, Nasty Plot or Swords Dance, making some powerful threats, such as Salamence, Gyarados or Scizor, unstoppable.
Tackle, Scratch, Pound... those are worthless. The Hyper Beam variants are pretty useless in most occasions, too.
Bide is useful if done at the right time so its not useless.
Bide, also known as "Hey, Gyarados, I'm giving you two turns to use Dragon Dance!"