Well, it would be pretty tough. I would suggest teaching that Pokemon special moves that aren't fire type.
fighting, fire, and rock.
Use dark or fire type moves.
Its best if you have 1 fire Pokemon and 1 ground Pokemon.
Water, ground, and rock.
the three starter Pokemon are the same in platinum as diamond and pearl. They are chimchar-fire, piplup-water, and turtwig-grass.
Well catch a fire type Pokemon like Ponyta train him to what level the Abomasnow is and use fire as I found out that his strongest weakness is Fire if you want to find out more info about Abomasnow search on Google 'Pokemon Marriland Abomasnow Platinum'
water is super-effective to ground, rock, and fire.
you can start of with chimchar piplup or turtwig piplup would be the worst because its third evolvation is water and steel chimcar would the 2nd best because fire can beat steel and the the best is turtwig cause its evolvation is ground and ground can beat steel and fire
There are 18 Fire Attacks in Pokemon Diamond, Pearl and Platinum.
Fire Pokemon are weak against water types, rock types and ground types.
Usauly you use water Pokemon to attack fire pokemons regards Jack
fire beats bug fighting beats ground rock or water beats fire fire beats phsicic and then there is a mix-upfor the champion