Complex sentence: Though he is absent from the main story, Meta Knight appears in "Kirby and the Rainbow Curse" (2015) as an Amiibo collectible figurine, which Kirby can use for a temporary increase in attack power.
Split into simpler sentences: Though he is absent from the main story, Meta Knight appears in "Kirby and the Rainbow Curse" (2015) as a collectible figurine. The game is also compatible with the Meta Knight Amiibo, which Kirby can use for a temporary increase in attack power.