Thread: Favorite Legends from each Region

Kanto:
Articuno: I love the design, it has a good movepool and going through the Seafoam Cave was really fun; to this day it's still one of my favorite Ice-types),
Mew: I always found it cute and intriguing, though I've never been able to get one. :(

Johto:
Ho-oh: Phoenix-based Legendary for the win! Also love the design and colors, it has a great movepool, I enjoyed going up the Tin Tower and I love its battle music.
Suicune: Its design and color scheme are pretty, and I just don't like the other two Legendary Beasts nearly as much.

Hoenn:
Latias/Latios: They're really cute and I liked their role in the anime.
Rayquaza: It has a cool serpentine design and I really enjoyed going through the Sky Pillar.

Sinnoh:
Cresselia: It's so pretty; I love the color scheme and design. It's one of my favorite Psychic-types, though I never got to own one. :(
Shaymin: It's adorable, not to mention I love hedgehogs. I wish I could've gotten one. :(

Unova:
Reshiram: It's one of the very few Dragon-types I like; it's up there as one of my favorites along with Altaria. It's really pretty and it's fun to use in battle. Also, it's about time there was a Dragon/Fire-combination.
Virizion: I love its design, it has a good movepool and I just don't like the other three Swords of Justice as much.
Victini: One of the few Event Pokemon I did manage to get (along with Celebi and Genesect). It's not terribly useful in battle and it has a bad movepool, but it's so cute and I love its animations and cry.

Kanto: Moltres
Johto: Lugia
Hoenn: Latias
Sinnoh: Shaymin
Unova: Tough call between Cobalion and Keldeo... I think I'll go for Keldeo

Kanto: none
Johto: Ho-oh, Lugia
Hoenn: Groudon
Sinnoh: Darkrai
Unova: Reshiram

Kanto - Zapdos
Johto - Ho-oh
Hoenn - Deoxys
Sinnoh - Giratina (favorite legendary overall)
Unova - Kyurem

Kanto - Zapdos
Johto - Lugia
Hoenn - Kyogre
Sinnoh - Darkrai
Unova - Zekrom

Kanto: Mew
Johto: Lugia, Entei, Suicune
Hoenn: Deoxys, Groudon, Rayquaza, Latios, Latias
Sinnoh: Dialga, Palkia, Giratina, Darkrai
Unova: Reshiram, Victini, Keldeo
Gen VI: Xerneas and Yveltal (well, so far..)

Kanto- Articuno
Johto- Suicune or Ho-Oh
Hoenn- Rayquaza
Sinnoh- Dialga
Unova- Reshiram

Kanto: Mew or Mewtwo
Johto: Ho-Oh or Lugia
Hoenn: Rayquaza
Sinnoh: Giratina
Unova: Zekrom or Reshiram

Gen I: Mewtwo
Gen II: Lugia
Gen III: Groudon
Gen IV: Giratina (Origin Forme), Darkrai
Gen V: Zekrom, Thundurus (Therian Forme)
Gen VI: Yveltal (Well, I'm sure it'll be one of my favorites)

Gen I: Articuno
Gen II: Lugia, Raikou
Gen III: Kyogre, Latios
Gen IV: Giratina
Gen V: Zekrom

Generation I - Mew Zapdos Articuno. Mew is absolutely adorable and I always liked it. Zapdos is one of the very few Electric types that I like in all, great design. Articuno is gorgeous as an Ice-Flying type

Generation II - Ho-Oh, Suicune. Ho-Oh is very colorful which I like a lot in a Pokemon. Suicune has a great design for a Legendary Water-Type

Generation III - Latios, Latias, Kyogre. Latios and Latias are pretty much my favorite Dragon Pokemon, great designs. Kyogre's moveset and design are great.

Generation IV - Dialga. Dialga has a great design, and its animation in the Generation IV games is great.

Generation V - Victini, Zekrom, Keldeo. Like Mew, Victini is absolutely adorable. Zekrom's shine and glow when its ability activates is really cool to see. Keldeo has always appealed to me since it was first revealed, great design and looks even better in its Resolute Forme

Kanto: Mew and Mewtwo
Johto: Ho-Oh and Celebi
Hoenn: Latios, Latias, and Jirachi
Sinnoh: Palkia and Giratina
Unova: Victini

Kanto : Zapdos
Johto : Raikou
Hoenn : Groudon
Sinnoh : Dialga
Unova : Zekrom & Black Kyurem, if that counts.

Kanto- Articuno, Mew
Johto- Lugia, Raikou
Hoenn- Latios, Latias
Sinnoh- Shaymin
Unova- Reshiram, Victini, Genesect
Gen VI- Xerneas so far

Kanto: Mewtwo/Articuno
Johto: Entei/Ho-oh
Hoenn: Groudon/Rayquaza
Sinnoh: Dialga/Darkrai/Giratina
Unova: Landorus

Nothing flashy.