Chirachiino (ホワイト) - I love normal types. If this generation had a couple more of them, I'd go through the game with only normals. But I love his movepool.
Jolly
Technician
-Bullet Seed
-Sweep Slap
-Encore
-Rock Blast
Mebukijika (グリーン) - Another Normal for my team. I'll probably want the autumn form of it (and I have no idea where to find the alternate sprites online...). It's nice to have a full-on grass resist, and its movepool is surprisingly wide for a quadruped.
Jolly
Herbavore
-Wood Horn
-Return
-Jump Kick
-Wild Bolt
Goruggu (ジメン or チャイロ) - Great defensive typing to switch in to a myriad of types, allowing me to have an easier time through the game. He also has a nifty movepool that is naturally learned. It provides necessary ghost, ground, and even fighting attacks. And why the hell can this thing fly?! Well, can't complain about that!
Adamant
Iron Fist
-Substitute
-Focus Punch
-Shadow Punch
-Fly (for utility)/Earthquake/Stone Edge
Aianto (グレイ) - Awesome typing, quick, and strong. Gives me a great set of immunities to help balance my team. I just wish he had a wider movepool.
Jolly
Hustle
-Claw Sharpen
-Iron Head
-X-Scissor
-Dig/Stone Edge/Baton Pass
Denchuura (イエロー or デンキ) - Unique typing, good ability to work with Thunder, good stats all around, and just a cool Pokémon. I hate arachnids, but this one's surprisingly... cute.
Timid
Compound Eyes
-Thunder
-Bug Buzz
-Volt Change
-Energy Ball
Daikenki (ブルー) - Pretty much the only decent water type this generation. Weird, how few water types were released, considering the past generations, especially Generation II, had a variety to choose from... Has a decent mixed movepool (but I really don't want to breed for Hidden Power Electric, important to a mixed set, early in the game), and will be my only surfer. Plus, I dig the 'stache.
Modest
Torrent
-Surf
-Hydro Pump
-Grass Knot
-Ice Beam
As for items, I'll probably just use whatever I come across (like MysticWater, Miracle Seed, etc).
I think this is pretty balanced... I'm considering replacing Aianto for something else like Rankurusu or Urugamosu, but I feel as though losing a reliable steel type is a bad idea. I think I have most of my needed resistances covered. Too bad I don't like any of the new fire types except Shandaraa, which I don't want to work on getting the dream world ability for. Hope it's good...
-Zane
Edit: Considering Victini now... Would probably help round out my team a lot better, considering I don't need Aianto for grass, normal, or rock resist, with Goruggo and Mebukijika around... Although, it does cause me to lose Dark resistance, and actually develop a weakness to it, but I've Denchura for super effective damage, I guess... It also means I have no dragon resist, but I don't think that'll be too big of an issue considering it's for in-game play rather than competitive play.