Bulbasaur. Years ago, I mentioned he looked like a garlic bulb so my kid gave me her plastic toy Bulbasaur and now he sits on the windowsill as the patron saint of my kitchen.
My favorite Pokémon has been poliwag ever since I played Pokémon blue for the first time. He so adorable and becomes a very powerful Pokémon. I remember catching him early on in Crystal version and making him my starter Pokémon.
Totodile. Elementary school me picked him at random when I played HeartGold (still hadn't wrapped my head around the whole touchscreen thing IIRC) and I loved the little guy.
As a child I trained a Kadabra to level 100 because another kid told me this is when it evolved.
Nope! We did eventually trade back and forth - but those 2 minutes of my newly evolved level 100 Alakazam on my friend's cartridge demanded an insane level of trust between two 10 year olds. That shit was intense!