4th Gen If You Were To Catch 1 Pokemon in Sinnoh...

[Swift!]

Leafeon, because it's the best Eeveelution and is also an epic Grass-type.
OR
Gliscor, because it is made of pure win.

 

[-Leaf]

Bonsly, and then evolve to sudowoodo cuz sudwoodo my fav.

 

[Percy Thrillington]

I'd get myself a Mime Jr. They're adorable and cute, and less likely to bite my hand off than any other Pokémon.

Wait, you do mean any fourth generation Pokémon, right, or is it any Pokémon we're able to obtain in Sinnoh?

 

[Lycaeus]

Shink (cuz of Luxray)
or Stary (cuz of Staraptor)
Being able to ride either of them around would be amazingly fun

 

[mStar]

I would pick Piplup. Since it evolves into Empolian.

 

[Lady Gaga]

lol i mean 4th Gen guys! :P

 

[Zennerick]

I'm Smart!

If I were to catch one Pokemon in Sinnoh, I would have then caught it. :cer_tongue:

 

[Alice]

Hmm... Buizel... Or maybe just a Pikachu. Either way I wouldn't let them evolve.

 

[~Fire Eagle~]

I'll get a Shinx so I can evolve it to Luxray.

 

[SparklingMistral]

I would catch a shiny Piplup. =] Or maybe a shiny Shaymin. ...or maybe just something shiny in general, haha. =]

 

[PokéMartin]

Mine would have to be either Evee or Riolu. Can't decide between them

 

[Cynic Kaka]

Shiny Ralts! :D

I love those guys.

 

[PlatinumDawnFtw]

Gible. As close to an uber as you can get.

 

[Micro]

Leafeon or Glaceon. They're cute! :3

 

[Flareth]

Hmmm, Sinnoh... I'd probably have to go with Turtwig, because I love turtles.
Thats about it.

 

[You're Gonna Go Far Kid!]

Definetly catching a Driftblim<3
Just drift around with him,listen to music,drink some tea...Ahhh....Totally relaxing.

 

[Rockarine]

I'll catch Luxray ! ^^ .. but my team now doeasn't contain any pokes from Sinnoh xD
I don't really like a certain pokemon in this region ^^"

 

[A Pokemon Player]

Feebas. It evolves into Milotic.

 

[HiroUey]

Would have to say Shinx, Piplup, or Starly, right now they are my strongest sinnoh pokemon, well i have there third stages, all sweet!

 

[Wolfwhispers]

Riolu, because then it evolves into Lucario, and I love the legend of the blue coyote that it was based off of.