First you need to have beat the Elite Four and gotten a National Pokedex. Then you have to keep saying yes to being envious of him and then he'll tell you the Pokemon he saw that day. The Pokemon he sees changes each day.
Mime Jr. can only be obtained in the Trophy Garden south of Hearthome City, talk to mr backlot inside the mansion every day and he will tell you what rare Pokemon is in his garden that day,
use the water stone on eevee. eevee found at the Pokemon mansion after obtaining nat dex talk to mr backlot
after getting the national dex go to the Pokemon mansion and talk to mr. backlot. he will say he saw a Pokemon in his garden if he says ditto then go look on the garden
you have to go behind of canalave city and then use your pokeradar and it will appear. Dont forget you only have 5% of finding it cause it is really rare,it took me nearly about an hour to find it. good luck
In the Trophy Garden behind Mr. Backlot's house.
Trophy Garden in Pokemon Mansion on Route 212 [talk to Mr. Backlot after you get the National Pokedex. Mr. Backlot is in the mansion, I think]. Hope this helps! Master
at the Pokemon mansion after obtaining nat dex talk to mr backlot
You talk to mr. backlot in the Pokemon mansion south of Hearthome city!
You get a pikachu by going to Mr. Backlot's yard and looking in there. To get other rare Pokemon from other reigons you have to get the National PokeDex.
he is in the Pokemon mansion
Mime Jr. can only be obtained in the Trophy Garden south of Hearthome City, talk to mr backlot inside the mansion every day and he will tell you what rare Pokemon is in his garden that day,
he is the owner of the Pokemon mansion.
Trophy garden at the pokemon mansion on route 212 (after obtaining the national pokedex , talk to mr . Backlot)
get a starly , then talk to the man next to mr backlot then you get a tyrouge. BUT BEAT THE ELITE 4 AND THE BATTLE FRONITER ON POKEMON DIAMOND
use the water stone on eevee. eevee found at the Pokemon mansion after obtaining nat dex talk to mr backlot
Trophy Garden (Talk to Mr. Backlot), Route 209, Route 210 (South) their are VERY RARE so you might want to use the Pokeradar. And it might take a Day or 2
Ditto you can find it in the Trophy Garden at the Pokemon Mansion on route 212. Talk to mr. Backlot after you get the national pokedex. Hope this helps! :)