Interesting fact:

With a body composed of lightning and taking the form of a wolf, the legendary Raijū is generally seen as calm and harmless. However, it famously becomes agitated during thunderstorms, leaping around trees, fields and buildings. It’s said that trees which have been struck by lightning have been scratched by the claws of a Raiju. Hence why you’ll see a Menetric using Scratch in the Pokémon games!