How do you get other types of Arcues' in XY?

Question

Sort of like- fire, fighting stuff like that.

Answer 1

Give it a Plate

You need to make it hold the Plate of the type you want.
There are 17 Plates all togather, the locations are here

Answer 2

You need to give it a special hold item called a "Plate", there is one for each type in the game.

http://bulbapedia.bulbagarden.net/wiki/Plate

The locations can be found in the link above.