Platinum: finished.
Candice was pretty easy. Froslass is a nice addition to her team, but manageable.
Volkner is fail. No surprise there.
Aaron gets most improved award. His Yanmega is damned nasty, and you still have Heracross to deal with when it's gone.
Bertha still sucks, and I didn't even have any grass attacks to use on her.
Flint has all fire pokemon! And is somehow even easier! Graveler versus Magmortar! Magmortar begins absorbing sunlight!!! EARTHQUAKE. Graveler versus Rapidash! Rapidash begins absorbing sunlight!!! EARTHQUAKE. Pretty much the worst AI I've seen all game.
Lucian is solid. His Bronzong is a lot weaker, but he adds a ridiculously strong Espeon to his lineup.
Cynthia was very easy until I got to her last pokemon Lucario. He heal-locked me with Aura Sphere. I literally went through every potion in my inventory before Aura Sphere ran out of PP. After the heal-lock was broken he went down easily.
I used the same team for the entire game. Ranked in order of usefulness with final levels and movesets:
lvl 50 Luxray (Crunch, Scary Face, Charge, Spark). Huge base stats and Intimidate means he rapes the maingame. Also doesn't hurt that three of Cyrus's final five pokes are weak to electric.
lvl 54 Golduck (Waterfall, Rock Smash, Strength, Surf). Good all-around - can tank, do big damage with Surf. Rock Smash is good earlygame also. Most useful one for Elite 4.
lvl 48 Rapidash (Bounce, Agility, Megahorn, Flame Wheel). A late addition to the team when I knew the Ice gym was coming up. Did everything I wanted it to - wicked fast and a solid attack. Don't think I ever missed with Megahorn. Was waiting for Flare Blitz though.
lvl 52 Graveler (Earthquake, Double-Edge, Stone Edge, Rock Climb). Good earlygame, nearly useless at the end. Dies to a sneeze from special attacks. Laughs at physicals though.
lvl 52 Torterra (Cut, Leech Seed, Earthquake, Giga Drain). Why so low? Because damn near every important trainer in the game has ice attacks on their pokemon. Solid defenses are meaningless against x4 damage. Offense was lackluster as well, needed Wood Hammer badly.
lvl 48 Drifblim (Flash, Defog, Fly, Shadow Ball). Despite the hitpoints, can not take damage well at all. Offense is weak as well.
Also got the National Dex, after using 21 Timer Balls and 38 Dusk Balls to catch Uxie. W. T. F.
Soft-reset/Masterballed until I got a good Azelf that I plan to use in the Dallas competion at the end of the month.