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
Probably a bit basic but Charizard and Umbreon. I like ditto and wooper too! Though my favourite starter is either totodile or cyndaquil depending on the day lol.
Wooper is such a vibe