Create your own move/ability/item/Pokémon
I saw a thread like this in another website, it was very popular and many of the suggestions were actually pretty good, although some were ridiculous and bad as well =/
Anyways, the point of this thread is to create something for a Pokémon game, be it a new move, ability, item, Pokémon, anything but let's please be sensible and not add anything implausible, ridiculous or just down right nasty here (yeah, I've seen some pretty bad suggestions in that other thread).
Type: Dark / Special
Effect: If Sunny Day is in effect, this move's type is Fire.
Description: Fires a strong flame corrupted by darkness.
Pokémon that can learn this move: Houndoom.
Effect: Dark and Ghost-type moves will have their base power increased by 25%; Psychic-type moves will have their base accuracy reduced by 25%; The move Moonlight will fully recover the user's max HP; The moves Synthesis, Morning Sun and Solarbeam will not work under the effect of Eclipse.
Description: Summons an eclipse that boosts the power of Dark-type moves.
Pokémon that can learn this move: Umbreon, Honchkrow, Darkrai, Dusknoir, etc.