Slow Start
For five turns, the Pokémon's Attack and Speed stats are halved.
Pokémon with this ability2 Pokémon
FAQ
What does Slow Start do?
For five turns, the Pokémon's Attack and Speed stats are halved.
Which Pokémon have Slow Start?
2 Pokémon have it, e.g. Regigigas, Varoom.