I know Sylveon is my pfp, but Espeon is my actual favorite. I started with the originals, so initially Eevee was something you only got one of if you didn’t trade. That made it special, and of course it was cute as a button, so I always tried to get one regardless of the game. Needless to say, I was super excited to find out you could catch wild Eevee in Gold/Silver. So I caught one and was determined to try to raise its friendship to get one of the new evolutions. It just so happened to happen during the day, so I got Espeon. The friendship mechanic made an already special pokemon that much better. It helps that it has a great design and a cool type, too!
Cyndaquil (plus Quilava and Typhlosion) will always have a special place in my heart. I started with gen 1, but something about silver really grabbed me so Cyndaquil was really the first Pokemon I had an attachment to.
While Sword/Shield had a lot of flaws, they gave me Toxtricity, who rocks. Literally! Using Boomburst while he “strums” the “strings” on his chest and annihilates my enemies… He’s a new favorite of mine. Also I like to sing System of a Down’s “Toxicity” when I use him in battle which really aggravates anyone who happens to be around when I play