You can use Action rReplay for DS Lite for Pokémon Emerald version. Action Replay allows you to do various cheats.
Action replay is a cheating method that can give you an advantage
yes
Some common questions for Action Replay are: Where can I buy an Action Replay? How do I use an Action replay? What items and Pokemon can I get off of an Action Replay? Should I use and Action Replay or a Gameshark? Is it easy to use an Action Replay? Do I have to enter in long codes for an Action Replay to give me what I want like I have to on a Codebreaker?
You need an Action Replay for GBA or GBA SP. Stick your action replay in your Gameboy. Stick Pokemon Emerald in the action replay. Type i n the code.
You can get the code on google and type in Pokemon Emerald ation replay cheat codes.
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)
You have to buy a GBA action replay from codejunkies.com. You'll find it.
Gameshark or action replay
you can only warp to the southern island in Emerald version if that's what you meant. You'd need a Gameshark for Emerald version.
you need action replay
action replay
you use a game shark not action replay. you can find one on ebay.com