Fire: Scorpion

Lightning: Raiden

Poison: Reptile

Ice: Sub-Zero

Hephaestus for fire

For Lightnings:

High Voltage

Taze

Stormlite

Sparkplug

Windshock

Or Pokémon Names:

Zapdos

Jolteon

Raiku

Electivire

Zeus for lighting wyvern

Spyro

Astalos p

Fire female: Ashe

Lightning:Thor

Black colored fire: Alduin

If female poison, Medusa