You climb up sky pillar.It's windy,raining,and thundering,you look up and see a dark green silhouette in the sky,then a massive green snake looking creature with two arms that have sharp claws on them and yellow and red design on his green scales that glow and yellow eyes comes from the clouds, the huge snake looking pokemon then Speaks

I am Rayquaza! why have you climb sky pillar!?

The thunder grows stronger when he speaks and it rains harder and Rayquaza wraps his body around the tower