Any time this gets asked, I'll probably always have to list out a lot. There's just so many good ones.
I'm very attached to Eevee bc ADORABLE. Almost like a mascot for me. But I love most fairy types. If it's pink, floaty, or cute I'll probably like it lol. I love Togepi/togekiss, drifloon, Munna/musharna, swablu/altaria, Flareon/leafeon/Sylveon, milotic, Clefairy evo line, goomy evo line... Braviary, corviknight, a lot of birds too ... So many. But I just usually say fairy types and baby pokemon lol.