The orbs that are used to summon the members of the Kami trio are Red, Blue, Black, and White. These are the colors of the first Pokémon games (internationally) and the latest Pokémon games.
The "Who's That Pokémon" segment was not shown during the original airing of this episode.
Who's That Pokémon: Lilligant
Pokémon Debuts: Thundurus, Tornadus, Gothorita (all outside of the movies), Landorus