Kanto, Johto, Hoenn, Sinnoh, Unova, and Kalos -the 6 regions of the main Pokemon games. They're all unique and have various interesting themes and etc. with them, Hoenn being tropical while Sinnoh was snowy, Johto being traditional while Kanto was more modern. But out of the games you've played or maybe just out of observance, which region in Pokemon did you like the least? 

For me it would have to be Unova from B/W (not B2/W2's Unova since I feel they fixed it and made it feel more "fresh"). The original design for Unova always felt a bit bland for me, sorta lifeless, I'm not 100% sure why I felt like that but it just felt like there was no love in it v.v

NOTE: Whether or not Sevii Islands in FR/LG, new Kanto in G/S/C/HG/SS, or whatever else are part of that "region" from whichever game is up to you.

Hoenn.

Gen III is also the worst.

Come at me.

I have played all regions, and IMO Unova on B/W was the very very worst, there where almost no places in the main story where you HAD to use a HM. It was also the most boring region. but if i had to vote for the most easy game ever it would be Kalos, and the most fun then i would vote for Hoenn or Sinnoh both regions where awesome. (Hoenn has far more awesome Pokemon desgins tho)

Unova already gets a lot of hate... but I dislike this region the most as well. Maybe its because I haven't finished Black/White nor have I started B2W2, but I find it the least interesting when compared to the other gens.

Most of the new Pokemon don't look that inspirational and aren't very memorable, etc.

It's not a bad gen, just one I like the least

Yeah HMs were almost absent in Unova B/W. Though I didnt mind that for strength/cut XD Kalos was pretty easy, then again I'd argue Johto on its own was also pretty easy. 

Hell yeah, Hoenn is awesome! Sinnoh was also cool, its weird that I feel nostalgic over it now 

B/W Unova is pretty uninspired and has the insanely useless Black City/White Forest... which WILL disappear if you stop battling people and after the main game the only people you can really battle is the E4  

B2/W2 Unova was a lot better though! Its a good gen, but a not-so-good region

I always played the flag game under the ground in the sinnoh region, with the secret bases together with a friend.. i was like 15 at the time and had very much fun with it, LOL. (yea so what) :( ITS MY LIFE!! i have played that game for 310 hours compared to 260 on Hoenn. 

Hmm, I haven't got very far in White as I only got to third(?) gym before I found other games more interesting, so I have yet to get to the White Forest and can't say much about this game

But if B2W2 is better, then I guess I eventually will have to try and beat both of these games

B2W2 is miles better. Especially for the Pokemon World Tournament

For me, Unova.

Black and White, while far from a bad game, was extremely forgettable, and not all that memorable.