Where to download a .save editor for Pokemon emerald

Try using Ciro's pokemon editor. It doesn't use .sav or any other save formats to edit but allows you to set options and export a vba/code breaker/gameshark/action replay code (pretty large) of what you have done. The negative of using this method is that the pokemon will be considered traded (not obey) unless you input your exact Name (no spacings unless if there are in game), Trainer id, Secret id, and Gender (Trainer info). Also, remember to use a master code (Check Output Master : anti-Dma). If you play competitively nintendo has methods of identifing hacked pokemon. The most known way is with calculating total EVs (stat wise what makes legendaries unique). Total EV (Sum of HP, attack, ...) cannot be greater than 510.