They are pretty safe unless you use the ones on the internet, some of them will crash your game but the ones on the action replay cartridge should be pretty safe.
I just wanted to add don't use codes like walk through walls and egg hatch fast cheats those are quite risky.
go to neoseeker.com
yes there are Pokemon event codes in all the Pokemon games for the action replay ds and the dsi you can go on youtube if you want to find them
You cannot use action replay on gba games
An Action Replay/GameShark, the game, and codes.
code junkies.com
it depends on the games but with my action reply disk you can use it in other games especially diamond and pearl ur a nerd
Action replay is a software with pre-loaded cheat codes that work across many games including pokemon white
GBA Pokemon games used Game-sharks not action replays!
With the appropriate codes, an Action Replay can get you any Pokemon that exist in your game and its predecessors (For instance, in Emerald you could get all the Pokemon in Emerald and the games before it)
no because they are different games.
http://www.neoseeker.com/Games/action_replay/
no i tried with euro games but nope.