Finale (Undertale) but with the Pokémon B2W2 Soundfont

Standing up to such a monstrous boss requires An Unwavering Heart, doesn't it? (There's some of Champion Iris in here, too, but I don't have a joke for that, sorry.) If you're wondering why I picked these specific Poké Balls to represent the souls, I picked them in pairs, aside from the basic Poké Ball representing the standard Red Soul: Catching a Pokémon by fishing or by surfing requires Patience. Catching a Pokémon at night or in a dark cave requires Bravery. Catching a Pokémon instantly and without harming it requires Integrity. Catching a Pokémon after a lengthy battle requires Perseverance. Catching a Pokémon that is weak and training it up is showing it Kindness. Catching a Pokémon to treat it luxuriously is showing it Justice. (Also, with the exception of the Timer Ball, all of these have at least a little bit of color coordination with the souls, which was convenient.)