Okay here I go!
10. Gogoat (I really like its simple design and has a decent moveset, and is also the first Grass Type to really like and have on a team)
9. Vanilluxe (I don't care what everyone says. I love ice cream. Vanilluxe is an ice cream. There's a connection here. Still, it would had been great if it performed better in battles.)
8. Garchomp (Awesome dragon pokemon which is powerful and had a great design.)
7. Zoroark (I really like its design and Illusion ability. It performs decently in battles and so I really like it)
6. Swampert (My first ever Pokenon, it holds a special place in my heart. As a kid my parents first got me Pokemon Emerald and so I never got to play earlier gens until the remakes. I remember starting with Torchic which I kept losing with. But after reseting I picked Mudkip and I started winning (It was actually my bad playing that made me lose with torchic as a kid), and so Swampert is one of my favorite.)
5. Swellow (I never treated this pokemon like much. But when I started competitive battling, I decided to try Swellow out and I was SHOCKED! The thing can outspeed everything and that Toxic Orb + Facade Combination can sweep through teams. Swellow has saved me from many tight spots.)
4. Samurott (My most favorite gen 5 pokemon. I wouldn't had placed it so high on the list though if it weren't for a Nuzlocke story I did based on a playthrough. I got emotionally attached to the him and in the end...Died.)
3. Lanturn (Best Pokemon. Typing aside, I will never forget the time Lanturn, equipped with a Rocky Helmet, survived 3 attacks from an Yveltal. I was SO surprised that I just had to record that crazy fight. That's why Lanturn is one of my favorite.)
2. Charizard (Design and Nostalgia plus epic Mega Forms and good competitively. I just love this pokemon.)
1. Latios (Design plus the movie (in which I cried as a kid) this pokemon wins first place because it has it all.)