Here are some of the ones you can get without trading/migrating:
Cyndaquil, Quilava, Typhlosion
Flareon
Vulpix, Ninetales
Growlithe, Arcanine
Magby, Magmar
Ponyta, Rapidash
Legendaries:
Moltres, Entei, Ho-oh
Fire stone
At Level 71, Feraligatr learns Hydro Pump. I would strongly recommend it for your Pokemon, as it is a strong and powerful move and exceptionally devasting against Fire-types.
Fire, Fighting, Steel and Rock.
There are 3 types of fire (or burning). They are: electrical, solar, and chemical.
Move tutor only in Pokemon Platinum, HeartGold and SoulSilver.
fire types such as arcainine ang ninetails also groud types are good
you can get a firestone in soulsilver by buying it at the poke"athlon dome on tuesdays
Fire stone
Fighting, Ground and Fire.
up to you heartgold has ho-ho (fire). soulsilver has forgotten the name (wind)
Since Karen's Pokemon are Dark types I'd recommend you use fighting types for Umbreon and psychic types on Gengar and her other's should be Vileplume which you need a fire type to defeat and Houndoom which is defeated with a water type.
Heatran is a fire and steel type pokemon. And Heatran's types do not change in different games. They are the same in Platinum, Pearl, Diamond, HeartGold, and SoulSilver.
you should use fire type
yes you have to win one at the pokeathlon
Maybe Typhlosion.:~)
Rock, or Ice types.
It can only evolve if you use a Fire Stone on it.