You can't change the way you look to others in Pokemon Diamond. The avatar that is chosen how you look to others is completely by random, and there is no way to change it.
Crobat can learn Mean look, and there are a few others that I forget.
No. You can't look like a Pokemon in Pokemon diamond. My brother has diamond and he can't look like a Pokemon.
bulbasaur ivysaur venausaur...and 490 others you should look in grass idiot! and migrate from GBA!
You have to look for them in Pokemon Diamond. you have to look around the corner of the shop.
look elsewhere...
Put some honey on a sweet smelling tree.(the ones that look different than others)
There is no Mean Look TM in diamond
look for it
Look for them in the grass
look for a difrent pokemon
Golbat uses mean look in Pokemon pearl but i am not sure about Pokemon diamond and pearl.
To get a Venusaur on Pokemon Diamond you have to get the National Pokedex and look for its area, if it's unknown then I don't know what to do.