#1 - Turtwig - The Ownage Turtle.
#2 - Treecko - The most badass starter without a doubt. (though not the best moveset >.<)
#3 - Chikorita - The most difficult challenge that isn't Charmander, but who gave a damn when you got CHAAARRRRIIIIZZAAARRRDDDD >.>
#4 - Chimchar - I have a strong dislike for the fire starters, but dammit, I love playing Infernape. I just wish GF wouldn't be so incredibly mean to the people who don't pick the fire starter >.>
#5 - Totodile - Feraligatr just looks so cool.
#6 - Mudkip - So I hea-never mind.
#7 - Charmander - I like me some Bellyzard.
#8 - Cyndaquil - Meh. Middle of the road for me; looks cool but my hate for the fire starters is what keeps him low for me.
#9 - Squirtle - Average, really. Nothing's particularly bad about Blastoise, but nothing's good about it, either.
#10 - Piplup - It beats half the legendaries in usefulness in Brawl (LOOKING AT YOU MOLTRES >.>), but it sadly doesn't even do that well in its own game except in a weather team.
#11 - Bulbasaur - I have an unexplained but unseething hate towards how fugly Venusaur is.
#12 - Torchic - Blaziken and his disco pants can bite me. >.>
Being politically correct for the thread's sake:
Kanto: Charmander (Strong dislike for the Kanto starters)
Johto: Chikorita (despite the challenge of being bested by 3 of the 8 gyms, resisted by 5 of them, and beating none of them barring Chuck's Poliwrath, Meganium kicks the other starters' asses.)
Hoenn: Treecko (Sceptile is oozing, leaking, and puking badassery, point-blank)
Sinnoh: Turtwig (I just love Torterra so much. I don't want to go to extreme lengths explaining it)
Best regions for starters:
#1 - Sinnoh: Sinnoh is the only place where all the starters didn't have one ugly duckling. Piplup in the game was nothing special, but in Brawl, hoo wee, we all have to run from EPUC PIPLUPZ.
#2 - Hoenn: Hoenn gave birth to an epuc internet craze, and had one of the best starters ever made in Treecko. It would be the best had I not had an unseething hate towards Blaziken (True story: Blaziken was my first RSE starter. I feel so ashamed admitting that, even on the internet.)
#3 - Johto: Chikorita was great, but Totodile and Cyndaquil were overwhelmingly everage in terms of usefulness. They looked cool, but then again, there are plenty of Pokemon that look cool but fail horribly.
#4 - Kanto: Aside from the competitive use of Charizard, Kanto's starters are all ugly and useless IMO. They all learn great moves but are overshadowed in both image and usefulness by other starters. Charizard isn't as cool-looking OR as useful as Infernape, Venusaur isn't (NEARLY) as cool-looking as Torterra or as useful as Meganium, and Blastoise isn't as epuc as Mudkip, as cool-looking as Feraligatr or as useful as Swampert.