I can't really decide on one, so I'll just pick a random Pokemon from Generation 4 that I like!
Lucario has to be my favorite Pokemon from Generation 4. It has a nice design, reminds me of some Egyptian thing. The colors are really good on it, it has a nice mix to it. It's a Fighting/Steel type, which is actually something that you don't see everyday. If my memory serves me correct, I think that Lucario is the only Fighting/Steel type Pokemon, which is what makes it unique. Also, both it's Attack and Special Attack stats are pretty decent. I'm surprised to see a Fighting Type have a better Special Attack than it's normal Attack stat. The speed is fine, I can work with it. I couldn't care less about the both Defense stats or HP. Later on in Generation 6, it gets a really awesome Mega Evolution. What's not to love about this Pokemon? That's in my opinion at least.
Lucario has to be my favorite Pokemon from Generation 4. It has a nice design, reminds me of some Egyptian thing. The colors are really good on it, it has a nice mix to it. It's a Fighting/Steel type, which is actually something that you don't see everyday. If my memory serves me correct, I think that Lucario is the only Fighting/Steel type Pokemon, which is what makes it unique. Also, both it's Attack and Special Attack stats are pretty decent. I'm surprised to see a Fighting Type have a better Special Attack than it's normal Attack stat. The speed is fine, I can work with it. I couldn't care less about the both Defense stats or HP. Later on in Generation 6, it gets a really awesome Mega Evolution. What's not to love about this Pokemon? That's in my opinion at least.