you cannot find one in Pokemon platinum u have to either trade from a friend or download from a gba game that has a salemance at pal park
Or if you want it simple then you catch a Bagon and evolve it into a into a shelgon and to my calculations it evolves into a Salamance -ShinyPonyFriends
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www.smogon.net/salamence
you need to catch a bagon and evolve it at level 30 into shelgon. shelgon will then evolve into salamence at level 55
no where
Bagon evolves into Shelgon at level 30 and then into Salamence at level 50
Salamence is a Dragon and Flying type pokemon.