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You don't, Mr. Backlot doesn't show you Manaphy but there's a book in his room that will show you a picture of Manaphy as well as add it as a "seen" Pokémon to your Sinnoh Dex.
He is in the Pokemon Mansion on the route below Hearthome City.
backlot's garden. south of hearthome. after obtaining the national dex. talk to backlot. to manipulate him, save in front of him before you press A, then talk and if he says something else, not eevee, turn off, then back on and talk again.
at the Pokemon mansion after obtaining nat dex talk to mr backlot
It's either you see a pic of him in a book in Mr. Backlot's office (pokemon mansion) or in a book in the library in canalave city