Encounter Codes (Modifier, Shiny and 100% Catch Rate)
I have a working Pokemon modifier code that works like the old games. Press Select to activate and you will get 649 master balls and 100 ultra balls. I'm sure you all know how to work this by now, but just in case: remove the number of master balls required to end up with the national pokedex number of the desired pokemon. Then remove the number of ultra balls required to get the desired level. Hold R and walk into some grass or a cave!
The shiny code is a little unfortunate. It does not work alongside modifier unless all you want is a shiny lv 100 genesect. It is activated by pressing select, which would reset the modifier to 649 master balls and 100 ultra balls. Sorry!
The last one is self explanatory, and requires no activation. I used it to catch Zekrom with a single pokeball. Some people say it stops working after a little while, but I have never run into the problem.