Charmander's flame

While playing my FireRed version, I put an eye on Charmander's Pokédex entry. It says, when the flame on its tail goes out, it'll lose its life.

Charmander's Pokédex entry in FireRed

This means, if it gets hit by a water attack like Surf, there's a high chance to kill it? Since Surf is a huge wave. Or when it's buried by Rock Tomb? The possibilities are endless. Poor thing...