It's kinda hard for me to decide, the first three are the only ones that are in order.
1. Weavile.
I can't really say why I love this pokèmon, since Ice-types are my least favourite, but this is an exception. Maybe it's because it's part Dark, my favourite type. I love its looks and it's the kind of pokèmon that I love to use: fast and with a high attack. I even have a handmade doll of it, a gift for my birthday last year.
2. Crobat.
I hate Zubats. It's hilarious, and I had my first Crobat just out of laziness, because I needed a Flying-type in HeartGold and I caught a semi-decent leveled Zubat that I trained. When it evolved, I started loving it. And I absolutely love its expression, since it looks always pissed and that's how I feel most of the time (especially when I "torture" myself with extremely hard hacks or Nuzlockes with absurd rules). I was so happy when I got a shiny Zubat and was able to evolve it in a Crobat, that was probably my best moment while playing pokèmon.
3. Scraggy/Scrafty.
I put them together because I love them equally. Although I'm not very fond of their cries (Scraggy's cry hurts my ears sometimes :/) I love their looks, and their animation with their pants always gave me the impression that they are clumsy. I adore their typing and movesets.
4. Zorua/Zoroark.
Same as above, I love them equally, but for different reasons. Zoroark looks cool, while Zorua is cute. I still think that their ability is very interesting, I still feel like an idiot when I think about the first time I used Zorua and I thought I sent out the wrong pokèmon.
5. Reshiram.
I love Black/White (it's my second favourite game in the franchise), and I still play it and enjoy it like it's the first time. Reshiram conquered me in the cutscene when it comes down to test you before the final battle with N, I especially noticed its eyes. Also, I love the combination of Fire-Dragon type.
6. Eevee.
Yes, a plain Eevee, not one of its evolutions. I liked it since I was little, so there's nothing I can do about it, I can't even explain why.
7.Honchkrow.
A crow with a fedora and a beard. And it's PINK when it's shiny. I don't think there's much to add.
Oh, yes, there is. Its Dream World ability it's Moxie, one of my favourites.
8. Ludicolo.
The platypus is one of my favourite animals, so Ludicolo had to make it in this list. Also, I sometimes get hypnotized by its dancing when I see or use one in Pokèmon games. I still remember an episode of the anime where there were three Ludicolo, dancing and singing. Their singing remained in my mind for days.
9. Vulpix/Ninetales.
Just as Eevee, I loved these pokèmon since I was little, though for them it's because I love foxes. I loved Vulpix because it looked extremely cute in the anime, and Ninetales just looks beautiful.
10. Krokorok.
This is one of those pokèmon that conquered me at first sight, since I loved its appearance and stance. It looks like he doesn't care of anything and it's extremely sure of itself. Shiny looks even cooler, with the black parts of its body replaced with yellow ones. Really, it's cool.
Honorable mentions: Victini, Archeops, Gliscor, Delphox, Froakie, Kingdra, Dragonite.
I'm sorry if this post was so long, but I never have many chances to talk about these things.
"Wait, she says...Do I look like a waiter?"
"The reason I forgive you is because you are not perfect. You are imperfect. And so am I. All humans are imperfect.[...]We don't get to choose our warts. They are a part of us and we have to live with them. We can however, choose our friends. And I am glad I have chosen you. Dr. Bernard Hasselhoff also said that everyone's lives are like a very long sidewalk. Some are well paved. Others, like mine, have cracks, banana skins and cigarette butts. Your sidewalk is like mine, but probably not as many cracks. Hopefully, one day our sidewalks will meet and we can share a can of condensed milk. You are my best friend. You are my only friend."