Better get this over with...
for Bottom Tier
Really, really early. You get it right after beating the first gym.
Terrible, all around. It's outclassed by Furret
in every stat bar Sp. Atk, and even Metapod is better defensively on the physical side.
Hidden Power, and that's it.
Varies. It's Hidden Power, for Pete's sake.
The Psychic type actually isn't half bad in G/S. With one exception, though. Guess which.
If its HP is electric or Grass, Unown fares well against Fisherman Justin on Route 32. Against the rest of the trainers in the game, you'd be better off using something else.