I don't think you can.
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You need a rotom then you can get to the next floor where you can change rotoms form and to get rotom you have to trade from diamond pearl platinum
You must bring a Rotom. if you do, you can go up the elevator to a room that has the items to change rotoms form. As far as I know, there are no more floors than those.
i think it already has the move when you encounter it. you see it at level 50. correct me if i am wrong
You must have a rotom from Pokemon diamond/pearl/platinum and have it as the first Pokemon in you party. Then take it to the lift and rotom will let you use the lift. After the lift has stoped you should be able to change rotoms form
Pokemon Mystery Dungeon: Explorers of the Sky is the third game in the Mystery Dungeon: Explorers series. It seems to be much like what Yellow, Crystal, Emerald and Platinum is to the other Pokemon RPGs in the Pokemon franchise. Explorers of the Sky is said to involve the next chapter of what happened to Grovyle and may invole the legendary Shaymin and Giratina (the title itself loosely references the movie in which Shaymin and Giratina appeared with a new form). Apparently, Explorers of the Sky will also feature the ability to play as some of the guild members - an opportunity to play as another Pokemon besides your starter which was previously unheard of.