Hmm... Favourite starters from each generation?
Gen 1 - Bulbasaur. Strategically, it's a good Pokemon to pick. Bulbasaur is super powerful against the first two gyms, and it is a grass poison typing which gives it an advantage.
Gen 2 - Chikorita. Unlike Bulbasaur, Chikorita is a horrible pokemon to start with as it is weak to the first gym, but Chikorita's weaknesses can be covered by picking up a Geodude in Dark Cave... I really like the design of Chikorita, and its evolutions.
Gen 3 - Don't like any of the Gen 3 starters
Gen 4 - Hard to say, but I'd probably go with Chimchar. It's a fire type, and it has a cute design, with a strong evolution. That said Piplup is a close second.
Gen 5 - Not really a fan of any of the starters of Unova, to be honest.
Gen 6 - Fennekin. It's a beautiful fox pokemon. It's evolutions are also inspired by the mage class in fantasy RPGs, which is my favourite RPG class.
Gen 7 - Rowlet, of course. I'm not sure how to explain why I like this one. It's just... good.
Gen 8 - Didn't like any of the starters shown in the trailer.