You really can't. There are some glitches like the cloning glitch though:
Go to Lanette's PC. Choose deposit on a Pokemon. Move to a box with Pokemon in it, the switch to a box without. Deposit the Pokemon here, switch back, and cancel out the PC menu. Then save and when it says "SAVING DO NOT TURN THE POWER OFF," turn the power off. Then turn in back on and you should have two of the Pokemon. FAKE FAKE FAKE. people whatever you do,don't believe this person. LIAR LIAR LIAR. stop making up stuff you noob, every1 nos it don't work. i tried it myself, and it doesn't work, so do us all a favor and stop making up stuff, get a life.
you can't do that you need a action replay or R4 if you want cheats. or.... you could probably use the events to get legendaries.but i know you can't use cheats without a action replay
No
NO!
Use an action replay.
You have to buy a action replay cartridge. Then go on codes and type in the codes.
Theres none so check google for game shark codes or use action replay and use action replay cheats for your gameboy
use action replay
A GBA action replay can have GBA cheats, but you can't put GBA cheats on an Action Replay DS even if you intend to use it on a regular DS with a GBA slot.
no you can enter them in manualy
You use action replay
Yes
Use action replay.