yes
Yes, unfortunatly!:(
I only erases your Pokemon from Leaf Green and that is because it just does. You have to make a choise to either keep them on Leaf Green or to migrate them.-hope this helped if not notify me. Fireheart997's Improved Answer: The other possible reason that this is happening is (and I've experienced it) you may have a fake or foreign copy. When you trade/send Pokemon to another GBC/GBA/console game with a fake/foreign copy your data will be automatically erased; it says so in most of the Pokemon games manuals.
the company disided it was to much work
You need to teach a pokemon strength. Its an HM and cannot be erased, so think wise about which pokemon you teach it to.
its telling you to get a life~
their was a answer here but um i accedently erased it UMMM......... SORRY.......I GUESS......
If you save, yes. If you don't, no.
you cant unfortunately. I was asking myself the same question. The answer is no
not to be mean but then it bad luck for you cause you gotta start over
the game is erased because it is a fake. migrating or playing another game will erase it. if you want to migrate take this advice. i too tried migrating, but my game was erased, twice. so my friend got Pokemon ruby and i borrowed it, (or if you have two DS') and i traded rayquaza, kyroge, groundon, etc,etc,ect. and i migrated from a REAL copy. if you want to migrate anyway.
it all depends on what you do it doesn't erase it's self
A HM is a tool that teaches your Pokemon an attack move and to move outside a battle, for example cut. HMs can not be erased from your pokemons memory.