Here's why:
* Route 224 is a late-game area. You won't encounter any legendary Pokémon there.
* Legendaries have specific locations. Legendary Pokémon in Pokémon Pearl are found in specific locations, often requiring special conditions or events to trigger their appearance.
To get legendary Pokémon in Pokémon Pearl, you need to:
* Complete the main story. Many legendary Pokémon appear after you defeat the Elite Four and become the Champion.
* Seek them out in their specific locations. This could involve finding them in caves, islands, or even completing special side quests.
* Meet certain requirements. Some legendaries require specific items, events, or even the completion of other side quests to be encountered.
For a list of legendary Pokémon and their locations in Pokémon Pearl, you can consult a guide or online resource like Bulbapedia.