Mr. Pokemon is in his house north of Cherrygrove City. You must stick to the right path to get to his house. You met him at the beginning of the game, along with Professor Oak.
you will find it north to cherrygrove, on route 30
At the top of Pokemon tower.
top of Pokemon tower
find him by the gate
You should be able to go to your pokedex and find "Mr. Mime". From there it should tell you.
Mr briney is in a house near petalburg woods.
go to mr stone
Try listening to Elm! He clearly states that Mr. Pokemon is on the path to Falkner's town. Just stay on the path and you will run into him.
You find Mr. Fuji in Lavendar Town's Gravehouse.
You find him first at the top of the Pokemon Tower in Lavender town.
Mr Fuji's house is in Lavendar Town.
You have to rescue Mr. Fugi from Team Rocket in Lavender Town.