how can i get dexys in pokemon esmerald?

Answer 1

You have had to go to a Nintendo Event!

Answer 2

Deoxys must be obtained through the Aurora Ticket, which could only be obtained through special events, such as the Pokémon Rocks America event or the “Deoxys Hunt” event that took place at Vue cinemas in October 2005 in the UK. Alternatively, the Aurora Ticket, or simply Deoxys itself, can be obtained through cheating devices.
http://en.wikipedia.org/wiki/Pokemon_Emerald

Deoxys has the ability to change its form to adapt to its current environment, a trait found in some microorganisms when introduced to hostile conditions. This feature of Deoxys manifests itself only in the Pokémon games, FireRed, LeafGreen, and Emerald. Each version features Deoxys with an entirely different set of statistics, moveset, and appearance, and as such encourages a different strategy in battle. The Deoxys of each version is unique to it: if traded to the other version, it will shift accordingly. If this technique is used properly, a single Deoxys can be traded several times to obtain the best moves from each form. Moves are exchangeable, but stats recalculate when traded. For instance: in Emerald, Deoxys learns Extremespeed, a Normal-type move that always goes first. Once this move is learned, Deoxys can be traded to FireRed, where its Attack form can use the move to devastating effect.
http://en.wikipedia.org/wiki/Deoxys

Answer 3

sorry! you have to go to a nintendo event. I wouldn't advise using a gameshark as it can corrupt your game. for more info go to serebii.net