Before putting a Pokemon into the daycare check its EXP in the summary ( example :: A Pokemon has 200 exp to get to the next level you would have to take 200 steps for it to level up.) I suggest getting on your bike and cycling up and down the cycling road for a while.
If you have the VBA emulator then you must press 1 and do what you want
In order to gain lots of experience at once, you must focus on raising one pokemon at a time, (No Exp. Share) and battling against Pokemon of a higher level. There is no easy way to do this other than finding a high-level Pokemon (At least at Level or above) with plenty of weaknesses and repeatedly battling them.Trainer battles result in much more Experience than wild pokemon, and rarer pokemon give more experience than common ones.
Defeating Pokemon that are a higher level that it, or Rare Candies.
if you got an egg and you want to hatch it fast then get a mach bike and do sandy slopes that will reduce half of the steps and also keep a fire Pokemon with it and also do a lot of bike riding
To get a Pokemon level up quickly is to have a Pokemon hold exp. Share and then just battle a bunch of trainers or wild Pokemon.
After you beat the elite 4 you can battle wally at the end of victory road after you beat him exit then enter and his Pokemon will be stronger
By trading, catching, and raising pokemon. It will take some time.
There isn't really a specific time to how fast your Pokemon level up. The younger the Pokemon(smaller the level) the faster they level up. also battles the Pokemon is in give it more experience. so if you wanted to level up a oddish and you gave it exp. share it would get less experience than if it was the first in the party/ battled the enemy Pokemon itself. If you trade what you want to train to a friend and give the Pokemon a lucky egg it well level up really quickly, only a few hours to wait and it will be level 100 in no time.
Before putting a Pokemon into the daycare check its EXP in the summary ( example :: A Pokemon has 200 exp to get to the next level you would have to take 200 steps for it to level up.) I suggest getting on your bike and cycling up and down the cycling road for a while.
for every step u take it gives like 2xp
Take 2 Pokemon that you want leveled up and bring them to the day care. walk around alot every step u take is 1 exp. point for your Pokemon
Mii Channel
cheat
try rare candies
Pokemon day care or put exp.share on a weak Pokemon
If you have the VBA emulator then you must press 1 and do what you want