Thank you very much for your answer, @Kaphotics . It helps me a lot, especially the inverse battle.
For the wild encounter editor, I only can edit rock smash, fishing and classic "walking" encounters (rough terrain, flowers, surfing,...) and there isn't "event" pokemon like the ones in trash can, rustling bush, drops from the ceiling or rustling berry trees (exclusive to X/Y ?). Maybe there are not in the garc of wild encounters ?
edit :
There is a little bug I noticed on Pk3ds. I don't know if it is just me or not, but, in the personal stats editor, I can check but not uncheck permanently TM/HM (the "legit" ones). All TM/HM unchecked for a species are checked again when I go back to that species).
Again, thank you.