Garbaje Pokemon like Parasect, Ledian, Beedrill, Torkoal, etc. They're a waste of space that could be put to better use.
I would beg to differ here. While I'm not going to say they are the best Pokemon, I did get a lot of use out of my female Ledian in my second run of X. Again, I am not saying Ledian is one of the best Pokemon out there, but she actually did very well on my team. She wasn't a heavy hitter, but pulled through when I needed her to, and the only time she didn't get to do much was facing the Elite Four.
I know many people wouldn't use Ledian in competitive play, but I personally don't care, as I will use the Pokemon I want. Some of them may not be the best, but I still like them anyway. In fact, I can say that Ledian is my favorite bug type. It may not be strong, but Ledian is my favorite anyway.
Although, on topic, I'm not a big fan of competitive play myself, so I don't really bother with it. I'd rather just play the game and have fun.