It stores electric energy under very high pressure. It often explodes with little or no provocation.
Stores electrical energy inside its body. Even the slightest shock could trigger a huge explosion.
It is dangerous. If it has too much electricity and has nothing to do, it amuses itself by exploding.
It stores an over flowing amount of electric energy inside its body. Even a small shock makes it explode.
The more energy it charges up, the faster it gets. But this also makes it more likely to explode.
— Pokédex entries (via PokeAPI)