Sakuramei

I'm kind of leaning towards Chikorita as I've never used one before, but have always really liked all of Johto's starters (and I've used Totodile in every version of Gold). Ultimately though, it'll probably depend on how the final evolutions look.

I'll list my top six since that seems to be the pattern here so far :P Mega Audino - Having been in the Pokemon Collectors community for so long, even if I mainly lurked, I really wanted to have a Pokemon that I just felt connected to in a sense? And just everything from the pastel colors to the magical girl-esque style and the whole healing thing on top of me just really liking Audino as well called out to me. With Audino itself, I just found it very friend-shaped, but I feel like the colors just come together better with its Mega form. I also love it's like... curly whipped cream tail. Slurpuff - It's a big squishy marshmallow friend and I love them. Alcremie - Can you tell I like dessert themes? :P Specifically, the Ruby Cream with Strawberries is my favorite followed by the "standard" version (Vanilla Cream + Strawberries). I just find it incredibly cute. Tinkaton - Reminds me of if you combined Amy Rose, Chao, and Chibi Usa into one creature and they're all favorites. With Amy and the Chao especially, Sonic is another series really important for me so it was hard not to immediately adore her. Shiny Ribombee - I just find it... so cute and pleasant to look at? It's hard to say exactly why it's a favorite, but it just makes me feel cozy. Dragonair - Despite its simplicity, especially compared to like... everyone else on this list, I've always liked its aesthetic and elegant look. It makes me think of if you like... personified a fountain if that makes sense and I love fountains.