There are a few things you can do in Pokemon games to level up your Pokemon quickly. Here are some ways:
1) You can go into the wild grass and waste your day away battling wild Pokemon
2) You can obtain the Vs. Seeker (I don't think you can get the Vs. Seeker in HG and SS)
3) You can find a route where you haven't battled any trainers and battle them
4) You can find your rival (wherever he/she can be) and battle his/her Pokemon
5) Leave your Pokemon in the Daycare Center and walk, run, or bike around
These are the ways I get experience.
Also, on number five, your Pokemon get one experience every time you take a step. I recommend you bike around an open area for a few hours
Also if you have a traded Pokemon it levels up faster which is pretty useful ( i got a traded cyndaquil lvl 1 to a lvl 40 typloshion in a single day ).
no point hacking u no...
You can use the Super-Quick Level Up Code.
get the game virus
but only without AR no cheats!
use a weak poekemon in battle
well i know some very good codes 1ST POKEMON CODES: Infinite Health 7183ca0c 39b88b73 Infinite PP 22719105 f87a2b40 d5762efb 1d69725f 376d9d29 649d3ddf dcfdd4cc cc760a31 Quick Level Up (30-40) 826eea09 ef6438bb Quick Level Up (50-60) cd5aae43 b74d6fb1 Quick Level Up (Max) 7e6ed527 5392afa8 2ND POKEMON CODES: Infinite Health 167224bb 1d06a233 Infinite PP 4b6f5f80 e493b4b1 bb2658ce fccc0f61 7083ee50 1c78f048 1c39eba9 07cbf223 Quick Level Up (30-40) 4ef68c0e 16360ae6 Quick Level Up (50-60) abab806d 3dfccd5f Quick Level Up (Max) 0de413d1 8f86bb7d 3RD POKEMON CODES: Infinite Health c1e614a4 f02680c8 Infinite PP b209766a c9a69ea6 bde08316 f6336978 97926761 5862d9ae 36afcd67 d4e7b8f2 Quick Level Up (30-40) 95df1819 03f95685 Quick Level Up (50-60) 60c6a790 2e7012f3 Quick Level Up (Max) 56c7303c 00c8ae95 4TH POKEMON CODES: Infinite Health 31297d1e 8b267a56 Infinite PP dbc84053 1d1aa108 8822144f 5ea64298 64927ce0 1560ced7 5248dba8 9148e996 Quick Level Up (30-40) 720eb9db af45df6b Quick Level Up (50-60) 2c9b047f b8ee6cef Quick Level Up (Max) b7ae6403 e982115e ITEMS IN STORAGE CODES: Have All Items ec76b120 73da0cc1
Battle the Elete Four over and over again and eventually your Pokémon will get to lv. 100.
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
mostly level 72 fire pokemon but if you cant level up quick go to hacked version at arcadeprehacks.com if you want to trade for a shiny golem search pokemon trade id and put 14ef47914a487f
In the game you have to battle alot of Pokemon till your Pokemon level up.On a pokewalker a hundred steps is a level up,but your Pokemon can olny level up one.
put your Pokemon in the daycare and get your bike out and ride up and down for 10 minutes or if you cant wait do it for 5 minutes your Pokemon will not evolve while in the daycare. the day care is in slaceon town
you have to login,then go to battle any member and when it loads type in the small box training and then type in the pokemon type,battle all the harmless pokemon and at the end your pokemon will have leveled up by 50 or even 60,70 levels up