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.)
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You give them lots of Gummies.
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.
Become a goast pokemon, use a mobile orb or get the IQ skill super mobile. You can also use a mobile scarf.
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?...
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.