Magmar does not use a stone to evolve. Instead, given a Magmazizer (Close spelling not perfect) and traded, it will evolve into its next stage.
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Magmar evolves when you trade it while holding a magmarizer.It then evolves into Magmortar.
The Pokémon that need items in order to evolve in Pokémon Platinum are Pikachu which evolves into a Raichu with a Thunder Stone, Nidorina which evolves using Nidoqueen with a Moon Stone, Nidorino which evolves into Nidoking with a Moon Stone, Clefairy which evolves into Clefable with a Moon Stone, Vulpix which evolves into Ninetales with a Fire Stone, Jigglypuff which evolves into a Wigglytuff with a Moon Stone, Gloom which evolves into Vileplume with a Leaf Stone or into Bellossom with a Sun Stone, Growlithe which evolves into an Arcanine with a Fire Stone, Poliwhirl which evolves into Poliwrath with a Water Stone or into a Polited when traded while holding a King's Rock, Weepinbell which evolves into Victreebel with a Leaf Stone, Slowpoke which evolves into Slowking when traded holding a King's Rock, Shellder which evolves into Cloyster with a Water Stone, Onix which evolves into Steelix when traded while holding a Metal Coat, Exeggcute which evolves into Exeggutor with a Leaf Stone, Rhydon which evolves into Rhyperior when traded while holding a Protector, Seadra which evolves into Kingdra when traded while holding a Dragon Scale, Staryu which evolves into Starmie with a Water Stone, Scyther which evolves into Scizor when traded holding a Metal Coat, Electabuzz which evolves into Electivire when traded holding an Electrizer, Magmar which evolves into Magmortar when traded holding a Magmorizer, Porygon which evolves into Porygon2 when traded with an Upgrade, Togetic which evolves into Togekiss with a Shiny Stone, Sunkern which evolves into Sunflora with a Sun Stone, Murkrow which evolves into a Honchkrow with a Dark Stone, Misdreavus evolves into a Mismagius with a Dark Stone, Gligar which evolves into a Gliscor when holding a Razor Fang and leveling up at night, Sneasel which evolves into a Weavile when holding a Razor Claw and leveling up at night, Porygon2 which evolves into Porygon-Z when traded holding a Dubious Disc, Lombre evolves into Ludicolo with a Water Stone, Nuzleaf evolves into Shiftry with a Leaf Stone, Skitty evolves into Delcatty with a Moon Stone, Roselia evolves into Roserade with a Shiny Stone, Dusclops which evolves into Dusknoir when traded holding a Reaper Cloth, a female Snorunt evolves into Froslass with a Dawn Stone, a male Kirlia evolves into Gallade with a Dawn Stone, Clamperl evolves into Huntail when traded holding a DeepSeaTooth and it evolves into Gorebyss when traded holding a DeepSeaScale and Eevee evolves into Vaporeon with a Water Stone, Flareon with a Fire Stone and Jolteon with a Thunder Stone.
Magmar does not evolve at any specific level. Magmar evolves when traded with a magmorizer. Magmar will evolve into a Magmortar if you trade it to someone else while it's holding a magmorizer.
No stone evolves swadloon. It evolves on level 32
You cannot evolve Magmar with a Fire Stone. You'll need to make it hold a Magmarizer and trade it.