Random Klefki outsped EV trained Xerneas?

Question

My Xerneas has 31IVs in speed, timid nature and 252 speed EVs.
It got outsped by Wilstrom's Klefki (unbuffed). (He used spikes, as far as I know this doesn't go first)
How is this possible?

Comments

i was very confused when my fastest pokemon got thunder wave by klefki when i battle elite 4 XD but after that i caught a klefki and knew why

Answer 1

Klefki has Prankster as an ability. It gives non-attacking moves a +1 priority.

Comments

Ah cool didn't know this, thank you :)