All you have to do is fill the Pokedex completeley. There are some pokemon which you will have to trade from white but you can do it.
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you cant
depends what pokemon it depends if it is a special or physical attacker
defog is no longer a hm move but if you want to get rid of it go to the place with fog on your birthday
nothing it gets rid of itself if put in pc box and it last a while i don't know why you want to want do get rid of it it makes it easier to train cause its stronger
Why do you want to get rid of pokemon in a pokemon game? That sounds useless... If you mean you caught too much pokemon you go to "PC" (in any pokecenter) and choose release pokemon.