Answer:
you just fly on to the left of the dragon statue door, follow the wind currents and defeat all monsters drag the key into the box on the far left, (these are the strange boxes that are connected to the wall, you make Cynder attach her self to the bottom of the one that looks like a key, then drag her to the left using spyro and insert the key into the hole) But first,before you do the boxes, you have to ram into the part of the wall that looks like a target, this will make most of the boxes recede into the wall, letting you be able to pull the box key into the hole.
If you need any more help with game, sense I've beat it 9 times, just ask me on the disuccusion page. If you want I can give you cheats that will help you alot. The very end of the game is almost impossible to defeat, unless you're really good at beating games. So you tell me on the discussion page if you want the cheats or not. Please don't hesitate to ask me anything!!!