Type Preview: Rock

It's a type known for physical defense, and for being the only type that would be super-effective on a Pokemon of all 18 elements. Its special defenses are in the crapper, though I can take steps to mitigate this. It's without question the most physically biased type in the game, and all of its Pokemon show up within 20 minutes of each other. It's weak to Fighting again, because I hate myself.

One question: Do you smell what the Rock is cookin'?

Type effectiveness:
Attacking: Super effective against Fire, Ice, Flying, Bug. Not very effective against Fighting, Ground, and Steel.
Defending: Super effected by Water, Grass, Fighting, Ground, and Steel. Resistant to Normal, Fire, Poison and Flying.

Dual types:
Fire, Water, Ice, Ground, Flying, Psychic, Bug, Dragon, Dark, Steel, and Fairy are all in XY. Add in Bank for Grass and Fighting.

Probable final team:
Binacle/Barbaracle: Ideally this would be an Omanyte, but Lord Helix is technically postgame so that's a no go. We'll make due with a Pokemon I've used before, who has decent move variety even if it's incredibly biased toward physical with the sole exception of Waterfall.

Dwebble/Crustle: Two words: Shell Smash. One more: Sturdy. Seriously, one Smash and this thing nearly swept Iris R2 in BW2. My body is ready to see if we can repeat this in XY.

Lunatone: I need one of the Celestial Bodies to make sure I have something else to switch into Earthquake, and Lunatone has a wider movepool. In fact, I'm probably not even using Special Rock STAB on this one because it doesn't have any - it does, however, have Moonblast.

Tyrunt/Tyrantrum: Rock/Dragon with psuedo-STAB on Dark moves and this thing hits like a truck. Since it's a fossil, it's way easy to control the nature.It may be possible to forego Earthquake and still rock everything.

Amaura/Aurorus: Wait, really? 2 Fossils? And the answer is yes. I suspect this one's more essential than Tyrantrum, so this is the control experiment.

Aerodactyl: 3rd fossil of the run. You get its Mega Stone as part of the story. I'd be a fool. Problem is, it's got like nine moves I want to use. (All three Fangs, Iron Head, Fly, Earthquake, Rock Slide, Crunch, and Dragon Claw.)

Why not use...?
Solrock: Really relied on move tutors when I wanted to use it, because the movepool is highly Special but the Attack is the higher stat. If I could get, I dunno, Zen Headbutt and Flame Wheel on it I'd be happier.

Relicanth: Combination of lower stats than Barbaracle and less overall damage even if Barb ends up with Sniper. Plus, it comes in at like, post-6th badge and I'll need a Surfer far before that.

Rhyhorn/Rhydon/Rhyperior: For all the love Rhyperior gets, I'm stuck with Rhyhorn for a long time and then it's a trade evo.

Nosepass/Probopass: Wasn't too thrilled with it in the Steel run and can't think of a Pokemon in here it's better than.

Roggenrola/Boldore/Gigalith: Trade evo, not enough advantages to being pure-Rock.

Carbink: The ability I want comes in hordes only, and Lunatone probably has a stronger Moonblast even without type bonus.

Corsola: Sucks [redacted] through a straw.

Geodude/Graveler/Golem: Trade evo, no real variety in moves.

Magcargo: See Corsola. If it could Power Gem I might've considered it, but no dice.

Shuckle: Probably the worst Pokemon possible for an ingame run, and that covers a LOT of ground.

Aron/Lairon/Aggron: Simple matter of availability (post-7th badge).

Larvitar/Pupitar/Tyranitar: Same issue as Aggron, with the added hassle of being a Y Pokemon.

Sudowoodo: Stats aren't that hot, and it's technically AFTER the 8th gym city.

Major battle expectations:
Viola: I won't have a Rock type at all or this would be a cakewalk, but since my starter choice is Chespin I'll still have Rollout.
Grant: An entire party of Pokemon who can use Rock Smash at minimum means this should be easy. Or I'll just use Amaura again.
Korrina: Aerodactyl and Lunatone get their paychecks here. And every other cave in the game.
Ramos: Aerodactyl is the obvious answer here, but the urge to get Dwebble into Crustle here is strong.
Clemont: Bulldoze or Dig everything before they can Thunderbolt us is the plan.
Valerie: Pretty sure someone's going to get to Poison Jab everything in sight, with comedy Ground moves for Mawile.
Olympia: Fire up Crustle, Barbaracle or anything with X-Scissor really.
Wulfric: Finally, something that can outrun Cryogonal. The hard part's going to be getting rid of Avalugg (probably involves Ancientpower from our two Specialists.)

Rival: He's stuck with Delphox, because I'm evil like that. Lunatone probably has the most fun here.
Team Flare: Scraggy/Scrafty are the trouble spots, along with the sick running joke of Gyarados problems.
Elite 4: Order is Fire -> Dragon -> Steel -> Water. Not going to have the option of randomly throwing Grass Knot on something this time.
Champion: Remember, Rocks take neutral damage from Flying Press. Also, Aero v Gardevoir is going to be quite entertaining for the eight seconds it lasts.

Trainer:
Since we're playing a female this time, and I'm not going straight for the "Roxanne" reference from RSE, I'm going to go with Joan (as in Joan Jett, best known for "I Love Rock 'n Roll"). The Pokemon will be named after rockers of choice as well.