Strategy for Catching Xerneas

I've beaten all the main stages up to this point (up to level 190 - Steelix at the time of this writing) and I still can't even complete EX18 - Xerneas, much less catch him. I want to get Xerneas so I can get Yveltal so I can get Mewtwo. Steelix was really hard for me to beat and I didn't catch him so I only have Mega Mawile, Nidoking, Nidoqueen, and Bronzong.

Is there some strategy I'm missing? Should I just grind levels on this team until I can beat it or should I catch Steelix first? Will I certainly need more gold or can I beat it without powerups if I get lucky?

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Strategy for Catching Xerneas - Black and White Chess Piece

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Strategy for Catching Xerneas - Gold and Silver Chess Piece

How do you catch Xerneas?

Go to Geosenge Town and go into Team Flare's headquarters, located northwest of town. Inside, you'll battle a bunch of Team Flare members. After you beat them, you'll free Xerneas/Yveltal. Go up to it to battle it.

What are the chances of catching a Xerneas?

#3 - Xerneas As Yveltal's counterpart and the mascot for Pokemon X, it comes with a catch rate of 45.

Is it possible to catch a Xerneas?

Xerneas and Yveltal are two of the Legendary Pokemon you can catch in Pokemon X and Y. Obtain the Psychic Badge and clear the Lysandre Labs area. Plenty of Ultra Balls. DO NOT USE YOUR MASTER BALL!

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Images: Cup of Couple, Tima Miroshnichenko, Yunus Emre Ilıca, Engin Akyurt