It is actually *more* expensive to buy the Pokémon Brilliant Diamond + Shining Pearl bundle in the Switch store than buying each game separately

Pokémon Diamond – $59.99:

https://www.nintendo.com/games/detail/pokemon-brilliant-diamond-switch/

Pokémon Pearl – $59.99

https://www.nintendo.com/games/detail/pokemon-shining-pearl-switch/

Bundle – $119.99

https://www.nintendo.com/games/detail/pokemon-brilliant-diamond-and-pokemon-shining-pearl-double-pack-switch/

$59.99 + $59.99 = $119.98

Save your hard earned penny and buy both games individually 🙃