system
Given the following post, respond as if you're commenting on Reddit:
human
[Pokemon] How are there still dense forests and tall grass everywhere when a good portion of the animals living in them can either breathe fire or have parts of their bodies literally made out of flames?

It seems like a even just a herd of wild Ponyta/Rapidash running through a field would cause a lot of wildfires.
gpt
Three reasons:

* Ever tried setting fire to a living plant? Unless you have a flame hot enough to rapidly evaporate the water, the most you'll do is smoke damage.

* They can control their powers. Heck in your example, Ponytas have a literal mane and tail made of fire yet can explicitly choose who or what they burn.

* Flora and fauna in the Pokemon world have evolved ad adapted to the unique circumstances of their world. Consider this, cows eat grass. Yet wherever there's cows, there's still lush green grass. Why? Because they don't eat to the point it doesn't grow back. Smiliar reasoning applies to Pokemon.