I don't get it... I've watched, played, web and asked abotu why Xion becomes a monster and fights Roxas?
She was cerated by who...or she created herself? Why is she normal sometims and then she's a monster? Please soembody tells me!

UMMM Shes not a monster . She was a replica of Sora made to copy his keyblade and etc so the Org could use her to gather hearts. In order for namine to fix soras memories and awaken him she needed Xion to return to Sora bc she was made from his memories. They also needed Roxas too.Xion forced Roxas to fight her so he would absorb her bc she knew they both needed to return ..The organization needed only one of them( xion or roxas) so they used devices placed in different worlds to transform Xion in battle with roxas.Which is why she changes forms in every stage of battle in the Xion fight. She was created by Vexen..Over time it was observed that she started developing her own personality and sense of self . The end XD

Across wrote:Xion forced Roxas to fight her so he would absorb her bc she knew they both needed to return ..

No one forced Xion to fight Roxas. Xion fought Roxas of her own free will.

The organization needed only one of them( xion or roxas) so they used devices placed in different worlds to transform Xion in battle with roxas.

Not technically true. Those devices gathered Sora's memories from those worlds and transferred them to Xion's body.

Which is why she changes forms in every stage of battle in the Xion fight. She was created by Vexen..Over time it was observed that she started developing her own personality and sense of self . The end XD

Before Xion fought Roxas, Xemnas gave Xion a "new body".