How do you get mean look in Pokemon platinum?

Catch a ghastly from the haunted mansion in Eterna forest. Level it until it learns mean look, or it may already know it. If you're using it to catch the fleeing Pokemon like Cresselia then you'll have to level it quite high for its speed to be adequate to keep up. for An extra speed boost battle fast Pokemon like golbat to build up your speed EV's.

Well u could jus give ur gastly with mean look a quick claw wich should be a lot eaysier than tranning it up to like 60

and u could give it speed potions to