Errr,Umm..There isn't IQ in Pokemon diamond. There IS IQ in Pokemon Mystery Dungeon.In Pokemon mystery dungeon, feed you and your buddies gummies that match their type- blue=water royal blue=flying red=fire yellow=electric black=dark clear=ice white=normal purple=dragon pink=physic green=grass .....am i forgetting anything?...
Chat with our AI personalities
You have to eat a lot of Gummis and watch your IQ boost. P.S. Find your Pokemon's favorite Gummi to make its IQ boost faster.
I don't think there is one, but if your Pokemon has maxed out IQ, they'll have the Super Mobile IQ which lets them smash through walls, if that's what you meant.
You give them lots of Gummies.
Become a goast pokemon, use a mobile orb or get the IQ skill super mobile. You can also use a mobile scarf.
You make your pokemon eat lots of gummis. It especially helps if you give them gummis that match with the type they are (ex. red gummis for fire-types, blue gummis for water-types, etc.)