Kebir

I fought a trainer at route 4 and two of my Pokemon raised a level. Both - Charmander (lvl 22) and Natu (lvl 25) - should evolve. I aborted Charmander's evolution a few times before. At the end of the battle Charmander tried to evolve, and like before, I aborted its evolution. But Natu doesn't even try to evolve. As result Natu/Xatu couldn't learn Air Slash at level 25.