You must first get Togepi on route 230 using your poke-radar. Then you must get Togepi to evolve into Togetic. Togepi is a happiness evolution, which makes sense as Togepi is a egg Pokemon.
Togetic cannot be found on Diamond and Pearl, check the question "How to get Togetic?" for more details on how to get it.
You get a togepi egg in Pokemon Platinum, not Diamond.
Togetic won't evolve in firered only in diamond, pearl and platinum.
you need to hatch a togepi in soulsilver or heartgold then trade it to pokemon diamond
togetic-togekiss
it evolves certain pokemon, like togetic
Roselia to Roserade and Togetic to Togekiss
no 1 cause togetic is gd
the shiny stone is used to evolve Togetic and Roselia.
togekiss but it can only evolve on dimond and pearl platinum it evolves with a shiny stone Togepi evolves through friendship into a Togetic. Then will evolve into Togekiss if you give it a Shiny Stone. Togepi will evolve into Togetic on any Pokemon Version, but Togetic can only evolve into Togekiss in Pokemon Diamond, Pearl, Platinum, Heart Gold, and Soul Silver.
No it is not possible but you can evolve it on Pokemon Diamond and Pearl if you wanted.
It evolves into Togetic and then in later versions of Pokemon like Diamond/White it turns into Togekiss.