We're not done here. First of all, you can now fight the guy who was guarding the door. He'll give you a Tyrouge when you beat him. There's also some double battles available if you're up for it. But you want to know what you should get ready for? That's right! Time to fight your rival again! 

Alex 
Sandslash - Lv. 36 
Flareon/Jolteon/Vaporeon (Counters your starter type) - Lv. 36 
Gardevoir/Gallade (Depends on what gender you chose) - Lv. 36 
Pidgeot - Lv. 36 
Starter - Lv. 38 

Someone's been training, huh? You get HM06 out of it. 

Route 660 

Pokémon:
Lv. 24-26 
Mankey - 25% 
Teddiursa - 25% 
Spoink - 15% 
Numel - 15% 
Blitzle - 10% 
Absol - 10% 

Items: 
Revive x1 
Ultra Ball x1 
Rare Candy x1 
Full Heal x1 
TM95 (Requires Cut) 

Trainers: 
Poké Fan Norbert* - Teddiursa Lv. 28, Spoink Lv. 28, Primeape Lv. 28 
Poké Fan Lydia* - Numel Lv. 28, Teddiursa Lv. 28, Zebstrika Lv. 28 
Cool Trainer Shelly - Delcatty Lv. 28, Whirlipede Lv. 28, Floatzel Lv. 28, Swellow Lv. 28 
Cool Trainer Webster - Linoone Lv. 28, Whimsicott Lv. 28, Quagsire Lv. 28, Golbat Lv. 28 
Youngster Keita - Psyduck Lv. 28, Absol Lv. 28 
Lass Lurleen - Deerling Lv. 28, Absol Lv. 28 

There's a fairly long cave coming up, so stock up! 

Cavern of Stone and Ice 

Pokémon: 
Lv. 25-27 
Woobat - 25% 
Cubone - 25% 
Sableye - 15% 
Mawile - 15% 
Tynamo - 10% 
Nosepass - 10% 

Items: 
Ultra Ball x1 
Iron x1 
Hyper Potion x1 
Carbos x1 
Nevermeltice 
Timer Ball x1 
Max Repel x1 
Elixir x1 
PPUP (Check east room rock) 
Nugget (Check west room rock) 
TM79 
TM80 
TM90 

Trainers: 
Worker Brand - Sableye Lv. 30, Baltoy Lv. 30, Magmar Lv. 30 
Worker Herman - Mawile Lv. 30, Koffing Lv. 30, Krokorok Lv. 30 
Hiker Justin - Nosepass Lv. 30, Boldore Lv. 30 
Hiker Keith - Dwebble Lv. 30, Marowak Lv. 30 
Pokémon Breeder Eustace - Woobat Lv. 30, Foongus Lv. 30, Slumga Lv. 30, Chansey Lv. 30 
Pokémon Breeder Ethel - Tynamo Lv. 30, Trubbish Lv. 30, Slugma Lv. 30, Togetic Lv. 30 
Scientist Marissa - Tynamo Lv. 30, Grimer Lv. 30, Porygon Lv. 30, Electabuzz Lv. 30 
Scientist Clarke - Nosepass Lv. 30, Magneton Lv. 30 
Worker Mitchell - Golbat Lv. 30, Maractus Lv. 30, Marowak Lv. 30 
Worker Morgan - Woobat Lv. 30, Litwik Lv. 30, Pupitar Lv. 30 

Nosepass evolves here if you level it up. As you can see, there's a lot of things to cover. The cave is split into three parts: east room, ice room, and west room. The ice room is a maze you'll have to manuver through in order to get everything and leave. Have fun! 

Route 661

Pokémon: 
Lv. 26-28 
Snorunt - 25% 
Vanillite - 25% 
Cubchoo - 15% 
Swinub - 15% 
Cryogonal - 10% 
Smoochum - 10% 

Items: 
Ether x1 
Revive x1 
TM03 

Trainers: 
Nurse Carol - Vanillite Lv. 30, Audino Lv. 30 
Parasol Girl Laura* - Snorunt Lv. 30, Poliwhirl Lv. 30 
Painter Pierre - Cryogonal Lv. 30, Smeargle Lv. 30, Jinx Lv. 30 
Biker Stanley - Cubchoo Lv. 30, Growlithe Lv. 30, Joltik Lv. 30, Scolipede Lv. 30 
Cueball Ricky - Swinub Lv. 30, Cacnea Lv. 30, Torkoal Lv. 30, Granbull Lv. 30 
Pokémon Ranger Lois - Munna Lv. 30, Tranquill Lv. 30, Ampharos Lv. 30 
Pokémon Ranger Eddie - Darumaka Lv. 30, Pinsir Lv. 30, Haunter Lv. 30 

Heal at the nurse obviously. There's two important things to note here. First is the ice rock, which indicates that this is where you get Glaceon. The second thing is the house. Go inside and talk to the old lady twice to get the backstory for some characters. 

Khione 

Items: 
Full Heal x1 
Light Ball (Talk to tennis girl) 
Poison Barb 
Super Rod (Talk to fisherman) 

This place becomes more important post-game. For now its best aspect is the move tutors. You can learn Fire Pledge, Water Pledge, Grass Pledge, Frenzy Plant, Blast Burn, Hydro Cannon, and Draco Meteor for free. The shard family teaches Fire Punch, Ice Punch, Thunder Punch, Signal Beam, Iron Head, Seed Bomb, Knock Off, Roost, Pain Split, Heat Wave, Giga Drain, Drain Punch, Earth Power, Zen Headbutt, Hyper Voice, Superpower, Dragon Pulse, Dark Pulse, Gastro Acid, Magic Room, Wonder Room, Stealth Rock, Outrage, and Endeavor. You can't learn from the shard family until you learn dive, but at least you can get free moves from the other family. 

Khione - Underwater 

Pokémon: 
Lv. 25-30 
Mantyke - 25% 
Remoraid - 25% 
Alomomola - 15% 
Shellder - 15% 
Corsola - 10% 
Relicanth - 10% 

Items: 
Red/Blue/Green/Yellow Shards 
Mystic Water 
TM55 

The shards respawn daily, so just come back and save up. 

Route 662 

Pokémon: 
Lv. 28-30 
Delibird - 25% 
Spheal - 25% 
Sneasal - 15% 
Snover - 15% 
Munchlax - 10% 
Seel - 10% 

Items: 
Dusk Ball x1 
Max Ether x1 
Max Potion (Requires Surf) 
TM13 (Requires Surf) 

Trainers: 
Swimmer Harold* - Shellder Lv. 32, Clamperl Lv. 32, Sharpedo Lv. 32 
Swimmer Kaoru* - Alomomola Lv. 32, Slowpoke Lv. 32, Corsola Lv. 32 
School Kid Keston - Delibird Lv. 32, Snover Lv. 32, Venomoth Lv. 32, Jumpluff Lv. 32 
School Kid Millie - Sneasel Lv. 32, Sealeo Lv. 32, Heracross Lv. 32, Gloom Lv. 32 
Richboy Martin - Munchlax Lv. 32, Stoutland Lv. 32 
Lady Colette - Seel Lv. 32, Bellossom Lv.32 

You run into Emil at the end. 

Emil 
Electabuzz - Lv. 38 
Simisage/Simipour/Simisear - Lv. 40 
Umbreon - Lv. 40 
Nidoqueen/Nidoking - Lv. 40 
Starter - Lv. 42 

Standard stuff. 

Gaea 

Items: 
Max Revive (Hidden behind some trees to the east) 
Rage Candy Bar (Talk to little kid) 
Rare Candy x1 
Twisted Spoon 
Berry Set (Talk to madame in fanclub) 
Cleanse Tag (Talk to psychic in fanclub) 
TM08 (Talk to blackbelt in fanclub) 
Pokémon Egg (Talk to gentleman in fanclub) 
Thick Club (Talk to gentleman after egg hatches) 

Boy, people sure are generous! They're a gossipy bunch too, so talk to the residents to find out some juicy information. This town is also home to the safari zone. 

Safari Zone Pokémon: 
Lv. 20-30 
Volbeat - 20% 
Illumise - 20% 
Sudowoodo - 10% 
Dunsparce - 10% 
Stantler - 10% 
Girafarig - 10% 
Kecleon - 10% 
Tropius - 10% 

Nothing crazy, so go nuts. 

Seventh Gym 

Trainers: 
Worker Pattson - Lairon Lv. 35, Wormdam Lv. 35, Magneton Lv. 35 
Worker Fred - Pawniard Lv. 35, Lucario Lv. 35, Bastiodon Lv. 35 
Backpacker Matt - Mawile Lv. 35, Scizor Lv. 35, Probopass Lv.35 
Backpacker Patty - Steelix Lv. 35, Excavalier Lv. 35, Metang Lv. 35 

Very straightforward. Just pick a path. 

Gym Leader - Vanna 
Bronzong - Levitate - Sitrus Berry - Lvl 40 
•Stealth Rock 
•Light Screen 
•Reflect 
•Gyro Ball 
Steelix - Sturdy - Sitrus Berry - Lvl 42 
•Stealth Rock 
•Roar 
•Earthquake 
•Gyro Ball 
Skarmory - Sturdy - Sitrus Berry - Lvl 42 
•Taunt 
•Whirlwind 
•Steel Wing 
•Air Slash 
Aggron - Rock Head - Sitrus Berry - Lvl 45 
•Head Smash 
•Iron Head 
•Fire Punch 
•Aqua Tail 
Obtain TM74 - Gyro Ball 

Her Pokémon are fierce for different reasons. Make sure you come prepared.

Things will seem off on your way out of town, but that's because we're about to dive into the heavily story-driven section of the game. You know, the part where you get the Pokémon on the title screen. If you need to go back and wrap a few things up (like GETTING THAT TICKET for example), now might be a good time. Anyway, to the next route! 

Route 663

Pokémon: 
Lv. 30-32 
Jigglypuff - 25% 
Ducklett - 25% 
Gligar - 15% 
Glameow - 15% 
Pawniard - 10% 
Scraggy- 10% 

Items: 
Full Heal x1 
Max Ether x1 
Max Potion x1 
TM29 

Trainers: 
Blackbelt Rocky* - Scraggy Lv. 34, Hitmonlee Lv. 34, Throh Lv. 34 
Battlegirl Maki* - Scarggy Lv. 34, Hitmonchan Lv. 34, Sawk Lv. 34 
Cueball Nicky - Arbok Lv. 34, Wigglybuff Lv. 34 
Biker Philip - Gligar Lv. 34, Floatzel Lv. 34 
Policeman Braven - Pawniard Lv. 34, Noctowl Lv. 34, Stoutland Lv. 34 
Cool Trainer Juliet - Glameow Lv. 34, Leafeon Lv. 34, Glaceon Lv. 34, Starmie Lv. 34 
Cool Trainer Grant - Ducklett Lv. 34, Cryogonal Lv. 34, Dusclops Lv. 34, Camerupt Lv. 34 

The little trees have switches to clear the way. 

Annihilation Base 

Items: 
Max Potion x1 
Ultra Ball x1 
Carbos x1 
PPMax x1 
Rare Candy x1 
Razor Claw 
Master Ball (Talk to Liepard) 
TM12 
TM42 

Trainers: 
Policeman Neagle - Pawniard Lv. 35, Machoke Lv. 35 
Grunt #1 (x2) - Murkrow Lv. 35, Mightyena Lv. 35 
Grunt #2 (x2) - Sneasel Lv. 35, Liepard Lv. 35 
Grunt #3 - Crawdaunt Lv. 35, Skuntank Lv. 35 
Grunt #4 (x2) - Houndoom Lv. 35, Cacturne Lv. 35 
Grunt #5 (x2) - Nuzleaf Lv. 35, Krokorok Lv.35 
Grunt #6 (x2) - Shapedo Lv. 35, Absol Lv. 35 
Grunt #7 (x2) - Umbreon Lv. 35, Absol Lv. 35 

GET EVERYTHING. Once you complete this area, you won't be able to come back. To the northwest of where you enter is a floor where you can rest and heal. The Liepard with the Master Ball is past the point of no return. Go through all the cutscenes, and you'll wind up in a double battle. 

Annihilation Boss
Skuntank - Lv. 42 
Absol - Lv. 42 

You don't have to win this, but it would be nice. Herc will poof you out afterward. While you might think this means you have to backtrack, you actually have to keep moving forward. So onward! 

Route 664 

Pokémon: 
Lv. 32-34 
Sunkern - 25% 
Croagunk - 25% 
Chingling - 15% 
Ponyta - 15% 
Skorupi - 10% 
Smeargle - 10% 

Items: 
Timer Ball x1 
Max Potion x1 
Float Stone 
TM01 

Trainers: 
Poké Fan Jude - Sunkern Lv. 36, Pichu Lv. 36, Iggybuff Lv. 36, Swoobat Lv. 36 
Poké Fan Sachiko - Chingling Lv. 36, Budew Lv. 36, Azurill Lv. 36, Leavanny Lv. 36 
Parasol Girl Melita - Croagunk Lv. 36, Lumineon Lv. 36, Seismitoad Lv. 36 
Painter Gough* - Smeargle Lv. 36 x3 
Gentleman Sheldon - Skorupi Lv. 36, Delcatty Lv. 36 
Madame Cassandra - Ponyta Lv. 36, Granbull Lv. 36 

Maze your way to the next town. 

Thanatos 

Items: 
Weather Rocks (Talk to twin) 
Light Clay (Talk to twin) 
Destiny Knot 
TM43 
Shinno Ticket (Help the Berry Mom) 

Pokémon:
Feebas (Trade Dragonair with Youngster) 
Zorua (Catch Giratina and talk to Veteran) 

In one of the houses, you'll find a mother who needs berries to make her jam. First she'll ask for Oran Berries, then Sitrus Berries, then finally Enigma Berries. After you give her the last batch, you'll get the ticket. The Feebas will evolve into a Bold Milotic once traded. Be sure to talk to the NPCs, especially the one in the southeast house! They'll provide a nice chunk of exposition. You'll also find the move relearner/deleter in this town.

Since the east path leads to a waterfall you can't go through yet, that means you'll have to go west. 

Route 665 

Pokémon: 
Lv. 34-36 
Vullaby - 25% 
Buneary - 25% 
Meditite - 15% 
Ferroseed - 15% 
Axew - 10% 
Rhyhorn - 10% 

Items: 
Max Potion x1 
Max Ether x1 
King's Rock 
TM93 

Trainers: 
Cueball Reese* - Rhyhorn Lv. 38, Weepinbell Lv. 38, Darmanitan Lv. 38 
Biker Charles* - Buneary Lv. 38, Eelektrik Lv. 38, Muk Lv. 38 
Veteran Murphy - Magmar Lv. 38, Fraxure Lv. 38, Staraptor Lv. 38, Carracosta Lv. 38 
Veteran Portia - Electabuzz Lv. 38, Medicham Lv. 38, Snorlax Lv. 38, Archeops Lv. 38 
Juggler Gary - Ferroseed Lv. 38, Vullaby Lv. 38 

Do what you have to do. 

Ancient Temple 

Items:
HPUP x1 
Max Revive x1 

Now we're getting somewhere! Follow Blake into the portal after the scene. I hope you stocked up on balls! 

Distortion World

Items: 
Griseous Orb (First area) 
Master Ball (Second area) 

Search each area for those items before approaching Giratina. Like in Black/White, you MUST catch it in order to continue with the story. Why do you think I was nice enough to leave a Master Ball nearby? Kill the Dusknoir that appears afterward, and warp out once that's all done with. Herc will give you Waterfall when you come out. 

Okay, last gym time! 

Eighth Gym

Items: 
Moomoo Milk (Talk to entrance guy) 

Trainers: 
Gentleman Stonewall - Sableye Lv. 40, Absol Lv. 40, Drapion Lv. 40 
Madame Marian - Spiritomb Lv. 40, Absol Lv. 40, Krookodile Lv. 40 
Richboy Rolan - Vullaby Lv. 40, Absol Lv. 40, Houndoom Lv. 40 
Lady Lina - Deino Lv. 40, Absol Lv. 40, Liepard Lv. 40 

Dark gym is very dark. It's a simple maze, so you'll get there one way or another. 

Gym Leader - Blake 
Scrafty - Shed Skin - Sitrus Berry - Lvl 50 
•Bulk Up 
•Drain Punch 
•Crunch 
•Rest 
Honchkrow - Moxie - Sitrus Berry - Lvl 52 
•Sucker Punch 
•Brave Bird 
•Superpower 
•Roost 
Weavile - Pressure - Sitrus Berry - Lvl 52 
•Pursuit 
•Ice Shard 
•Low Kick 
•Night Slash 
Tyranitar - Sand Stream - Sitrus Berry - Lvl 55 
•Payback 
•Pursuit 
•Low Kick 
•Stone Edge 
Obtain TM66 - Payback 

Honchkrow is bad news for Fighting/Bug types, so watch out for that. Really each of his Pokémon has something going for it, and it's up to you to put them in their place. This is the final battle with Blake! Make it count!