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You Can't
Use Gameshark or Action Repley codes
not unless you have AR {action replay}
That is actually possible if you don't feel like catching any pokemon you can have a friend trade you all of them and then you will have the pokedex finished without using any pokeballs.
no way except you found a gameshark code to finish the pokedex, some Pokemon can't be found in emerald, you have torade them from ruby or sapphire
actually i dont want to say this but NO
You can go into the Pal Park and then leave without catching anything. Sometimes you have to, actually. For instance, if you are migrating some ocean Pokemon and you didn't bring any Pokemon with you that allow you to surf... you need to leave, change your party, and come back.
how to get all the tickets in Pokemon emerald?
i don't have emerald but the valuable Pokemon is rayquaza
You cannot get all 3 Starter Pokemon in Pokemon Emerald without trading for the other 2.
There is no way of getting Pokemon without catching them, unless you cheat.
You need to Migrate Pokemon from the PC boxes from GBA Pokemon games then you can enter the great marsh. if you have the DS I. You can't do it. I hope i answer your question? so if you don't migrate Pokemon from: FireRed LeafGreen Sapphire Emerald RubyEtc. you can't enter the marsh (Catching show thing)