And even the Pokémon who can learn those attacks and cover many types cannot always use them effectively, depending on their strengths. Have you ever tried teaching an elemental punch to a Blissey?

[Spoilers: it doesn't do much. He stands up and leaves the image as he speaks, possibly to go look out the window.]

...I think they're trying to lull the local Grimers into a false sense of security before starting to practice again. Goodness.