Terrible Turnip

If you plant an Ominous Seed at Sunsong Ranch it can grow into the Terrible Turnip. Ominous Seeds are rarely acquired when harvesting fully-grown vegetables.

And you thought turnips at the dinner table were bad.

Though not a particularly powerful battler, this pet is greatly valued by serious collectors due to it's Weakening Blow ability, which cannot kill an opponent, and can only reduce hp to 1 (though its other abilities can kill). This allows collectors to easily and safely reduce the hp of a pet they wish to trap, without any risk of killing it.