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
Pokemon within each tier is in no particular order (at least, regarding which I like better or worse). Being at the beginning just means that they were categorised the earliest (so there is a sort of order, the ones at the end were usually the ones that I struggled to decide on, but that’s not always the case. Also, I went through them through their Pokedex numbers, so you will see that too)