Question

Like Blaze, Torrent, Swarm etc.

Answer 1

If your Pokémon has less than 1/3 HP, it's STAB on basic type will become +125% instead of +50%.
Like:
Blaze - Fire STAB
Overgrow - Grass STAB
Torrent - Water STAB
Swarm - Bug STAB

Answer 2

Those type of abilities don't activate until your pokemon's HP falls below 1/3 its maximum. If my Typhlosion has 300 HP, and he falls below 200, then blaze will activate. It powers up your pokemon's move of that type, so it's like having a double STAB.

Comments

Lol Typhlosion

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Yeah I have one too, its true

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in the anime it's less than 1/3rd...but then again, since when is the anime ever right?