Garbador. I thought it was going to be a really bulky physical thing to fit with its stats, but it turned out to only really learn special attacks and only poison type moves.

Purrlion/Liepard- Purrloin hits horrendously weak compared to the other little pokemon in the beginning of the game, and Liepard isn't much improved except for Fake Out. It sucks because the design is a lot cooler than the other fancy cats- Glameow and Purugly.