Cyndaquil is my favourite pokemon of all, well the spot can maybe be shared with Whimsicott.
It was my first pokemon ever, and I've always loved that design so much, plus the cry, and evolution 100% Amazing.
I love Litten, despite hating it at first. Chimchar and Fennekin tie for my least favorite. Serena in the anime seriously ruined Fennekin for me, and I'm just biased against gen 4.
Fennekin is my favorite. Fennekin was the first fire starter to make a place on my main team. I usually stuck with the water types. I also loved Fennekin's evolutions. The fire/psychic combination was one of my favorites in Pokemon X.
Charmander is probably my favorite because dragon. It has such a simple yet memorable design! I like Litten too, though I would've preferred if Incineroar turned out to be something a little less humanoid. I don't mind the design though.