Fire Red - Tauros - Figured I use him to surf to Cinnabar, became bros and used him for what was left of the game. Emerald - Shroomish - Wanted a grass type to cover for Torchic. Breloom became my favorite Hoenn pokemon. Carvanha - Needed something that could surf, became one of the few water types I like. Black - Sewaddle - Ran into a shiny one, decided to use her. She never failed to get the job done. Sandile(second run) - Thought I would use it for a bit, Nixon the Krookodile ended up leading the team. Black 2 - Swanna - needed something to surf and fly, La'Swanda ended up saving my ass on more than one occasion.
Probopass. In fact, I hated it at first. I thought they completely ruined one of my favorite Pokémon (Nosepass).
But the thing is... I love noses and mustaches... so it was only a matter of time before the big lug grew on me. I love the mininoses, love the mustache, love the giant nose, love the 'hat,' love that it's based on a moai statue, love that it's a defensive Pokémon, love that it's a steel type that is better at spec than att, and love pretty much everything about it now.
http://reddragonranch.blogspot.com The Legend of Red Dragon Ranch - A new breed of monster training!
Dunsparce. It ended up becoming one of my favourite Pokemon surprisingly. GREAT movepool, serene grace as it's ability and i noticed it has such a cool colour combination of yellow and blue. I just now hope it gains an evolution this generation of either Normal/Dragon or Normal/ground. Even just Normal would be fine tbh as long as it gets an evolution.
R/S/E: Ralts. Hated it when Wally first caught it, but went out of my way to find one to fill my dex. Now Gardevoir is my favorite pokemon D/P/Pl: Loads. Electevire and Magmorter, due to not liking Magmar and Electabuzz as a kid, Starly due to just thinking "Another pidgy", Buneary/Lopunny due to thinking they couldn't possibly be good, and in all of these cases I just plain grew up and realised they were all awesome B/W/BW2: Emboar, not liking the third fire/fighting, but then realised it was pretty damn versatile, Lilligant due to thinking it just looked like Princess Peach but then realising the potential of Quiver Dance/Petal Dance/Own Tempo, Darmanitan due to catching it because I needed a fire type on my Snivy run and then realised "Holy crap this thing is a badass", Cinccico because I thought it looked to cutesy, but then grew to love it's spam attack style...Lets just say Black and White suprised me a lot.
Ampharos. On my first file of SoulSilver, I didn't get it. I just didn't understand why anyone would use that thing. On my second file, I decided to use it... Next to Alakazam, it's the best thing on my team... And that's including Gyarados and Gengar.