I you have beaten the elite 4, then use exp. share and bring your highest level Pokemon to battle with. If you haven't done so, then bring the Pokemon you want level in your party and go fight the more recent trainers. When you get the vs. seeker, just use that in an area you just fought in.
use a weak poekemon in battle
the easiest way to level up your Pokemon to put it in daycare Pokemon will level up soon.Trade the Pokemon to friend and have it hold a lucky egg it will level up quickly.
Battle the Elete Four over and over again and eventually your Pokémon will get to lv. 100.
no point hacking u no...
You can use the Super-Quick Level Up Code.
The easiest way to level up is to feed Pokemon Rare candies.
get the game virus
To level up weak Pokemon, I suggest battling the elite four with the weak Pokemon in the front of your party. As soon as the battle starts, switch Pokemon. The weak Pokemon will gain experience as well. Or, you could use an Action Replay. Take your pick. ~Riamu589
but only without AR no cheats!
on Pokemon diamond or pearl just get a lot of rare candies and give tham to your Pokemon or if you cant find any go to the day care lady let her raise your Pokemon until there 1 level below the level that he/she ivolves at then level him/her up simple hope i helped
The easiest way that I have found to level up quick is to play Headquarters Pro or capture the flag. If you are wanting to level up quick I would play one of those, I wouldn't play Teamdeath Match or Free for All, if you want to level up quick.
You can get a level one hundred Pokemon in HeartGold the same way that you can get a Pokemon of that level in other games. You have to level them up until they reach it.