* Completing the Pokédex: Catching all three Lake Guardians contributes to completing the Pokédex, which can unlock certain features or rewards in some games.
* Strong Pokémon: The Lake Guardians are powerful Pokémon with unique abilities and moves that can be valuable for your team.
* Story progression: In some games, catching the Lake Guardians is required to progress the story or unlock certain areas.
Specific to certain games:
* Pokémon Diamond, Pearl, and Platinum: Catching all three Lake Guardians unlocks the ability to battle the legendary Pokémon, Giratina, in the Distortion World.
* Pokémon Brilliant Diamond and Shining Pearl: Similar to the original games, capturing all three Lake Guardians allows you to access Giratina in the Distortion World.
Overall, while there isn't a specific bonus for catching all three Lake Guardians, they are valuable Pokémon with significant roles in their respective games.