I'm training a sewaddle to be a Leavanny to have a really good pokemon collection from the Unova to use in the battle subway & his highest stat is defence. When he evolves into Leavanny, will his defence be lowered to become stronger in attack, or will his attack suddenly get super powerful boosts & his defence not be lowered? I'm not sure how the stats change through evolution, can someone please explain this whole stat thing to me?