I can't believe I have to repeat myself here, but you can't just come in and list the favorites already guessed without giving a list of hints already given.
So I'll just say Emboar and be done with it for the day.
Any of these?
Charmander to Charizard, Grovyle, Cyndaquil to Typhlosion, Oshawott to Samurott... or Zekrom.
Or is that cheating? :p If it isn't then mine's fantastically easy. I'll get rid of Zekrom, though, don't reckon too much Zekrom trading goes around outside of the games...
I'm going to go with... Grovyle?
HOW DARE YOU! YOU SAW MY FAVORITE PKMNS IN MY PROFILE! No it isn't Grovyle. Aw, come on guys. 2nd hint: (Everyone is going to know.) It's the only starter that his last evolution is a flying type. Who's that last evo?
Element0...Emboar? Taichi Wind your favorite is...Lapras?
Haha! I got you! Your favorite is CELEBI! From Serebii.net! (Element0, I know your 3rd favorite! I will wait for you to post. Hint for my 2nd favorite: It's from Johto. He's a last evo. His 1st stage is a Timid type.
You're correct TaichiWind! Magneton is my third favorite Pokemon. Now for my fourth favorite. It's from the first Gen again and it's first form is kind of wimpy looking, but it's final evo is pretty cool looking.