Personally, mine is joint first between Sandshrew (the cutest), Espurr (most relatable), and Gastrodon.
After those, in no particular order, I like Turtwig (best starter, fight me), the Roggenrola line (little rock guys), the Litwick line (candles and lamps with nefarious intentions), and Metagross (cool robot thing).
Kyogre is the best legendary in my opinion
Back when I was really into Pokemon I liked Dewott. After not playing Pokemon for several years, I think Pikachu became my favorite; it’s really the only pokemon you get exposed to if you don’t play the games and the design is very iconic.
About a year ago I played Cobblemon (Minecraft Pokemon) and Joltik / Galvantula became my new favorite. 🕷️