where do you guys go to train quickly to level 100? i know there are a few options like elite four, battle chateau, shaking grass audinos, etc... but i just wanted to know what you guys tend to do the most and found the fastest. thanks c:
I do Rotation Battles at Restaurant Le Wow. There's no reason to train to level 100 though, you only need to get to 50 to participate in wifi battles. There are only a few exceptions for moves that are learned after level 50. (For reference, many moves learned after level 50 now can be taught at the move relearner in X/Y. For example, Volcarona used to learn Fiery Dance at level 100, but now also learns it at level 1. Same with Brave Bird Talonflame.)
This is how I train them:
(1) Level 3 EXP O-Power
(2) Lucky Egg on all pokemon that are being leveled up (you get one during the game in one of the hotels and you can steal them from wild Chansey in Friend Safari)
(3) EXP Share on if you are training more than two pokemon
(4) Front pokemon that does all the work is:
Mewtwo @ Mewtwonite-Y
Timid Nature
252 SpA, 252 Spe
-Aura Sphere
-Psystrike
-Thunderbolt
-Ice Beam
(Mega-X works also with a specially-oriented build, but it's better if you use a physical one.) Mewtwo is caught at level 70 in X/Y, and the pokemon you battle in Le Wow are mid-60s. So without any additional training, the cartridge's Mewtwo is still able to 2HKO everything I think. Regardless, if you do this enough, your Mewtwo will also level to 100 eventually, at which point it can OHKO everything with a neutral coverage move. If you find your level 70 Mewtwo is not quite OHKOing anything, then replace Ice Beam with Calm Mind. Set up one or two CMs and then sweep with neutral moves. (In some of the battles, at least 2 of the 3 pokemon you face share a weakness to one of the moves on this set, while the third is neutral.)
(5) Simply put Mewtwo (Mega-Y) at the front of the party to solo battle the entire restaurant. The next two pokemon get full EXP as if they participated (special mechanic of rotation battles) and all other pokemon will get 50% EXP from the EXP-Share. I also suggest EV-training your pokemon before battling in the restaurant. (The easiest way to EV-train is by using Sweet Scent horde battles with Pokerus. Even without Pokerus, it is faster than Super Training.)
With Lucky Egg + Level 3 O-Power, almost all pokemon (except those that have a high experience requirement) will get to level 49 or 50 by the end of Sweet Scent horde EV-training and one round of the restaurant battles. Max friendship pokemon also get more experience, so that is an option if you plan on raising their friendship anyway. If you have two cartridges (or downloaded copies) you can also trade the pokemon since traded pokemon gain more experience also. But Lucky Egg + L3O-Power is sufficient and likely all that most people will be able to do.
Before I had level 3 O-Power, I never had to do more than two rounds of the restaurant battles though. Each round takes about 10 minutes maybe (?), probably less if you have animations off. It's very quick. (Also note that since all of the battles are fought in succession, the O-Power will not expire until the end of the entire round.) This is also a good place to use Money O-Power if you need money for some reason.