Raise your Pokemon by 30 Levels (Overnight!!!!!)!!
Its acually simple. Just have a charger plugged into your GBA.
Its acualFirst Put two Pokemon in the daycare centre.
Get an Acro Bike and go to a mud hill.
Notice that when you try to go up it you fall back down.
Put something heavy on the UP BUTTON and leave it overnight.
When you wake up and go to the daycare your pokemon will have gone up by about 30 levels!!! Genius eh ???
PS. It does really work !!!!