I'm finally going for level 100 pokemon since red and the missingno. rare candy multiplying thing.
In other words, I'm going to train my team to level 100 for the first time. Highest I ever got was in the 70's in Gold.
Not only that though, I'm training 2 teams to level 100. My normal team, and a Uber team. (this is all in platinum, but I figured this would be a better place to put this, since it's technically not plat specific)
Any hints, tips, tricks I should know? (I don't EV train) Anything to make it take less time? etc.

I recently decided to do that, too, recently. I've been training in Stark Mtn. and at the Battleground. I didn't think that my Pokemon were powerful enough to take on the E4 yet. That's what I'm aiming for. Then, it's a lot of grinding.

I always had a level 100 Pokémon in any given generation.

So far, I've almost gotten three lvl 100s not from the GTS that Ive trained. Ive also got a lot needing to be trained...

(Speaking of the GTS, the day came when I asked for Spiritomb, and found it at lvl 61, caught at "Pokemon League"... Hmmmm... I guess Cynthia decided she didn't want it anymore or something.)

Tips- use a lucky egg, if you can trade them to another game, and fight either your rival in DP, by resetting the date, or the gym leaders with their new teams in Platinum. Ive gotten at least 6-8 thousand EXP doing it, took about 4 hours to get from 40 to 100 on my diamond before platinum came out.