I'd include something about it being the obligatory rock type with low speed and high defense and how it faces stiff competition as a Shell Smasher from Omastar. Then talk about how Crustle's main advantage over Omastar is dual STAB. Also take out the mention in Blastoise as it is officially UU.
† I have accepted that Jesus Christ doesn't exist and am proud of it! Please do not copy and paste this because no one gives a shit about your religion.†