How can you get inside the dragonss den in blackthorn city Pokemon glazed?

You can't actually get inside the Dragon's Den in Pokémon Glazed. It's a visual element of the game, not an explorable area. It's designed to be a visual representation of the Dragon-type Pokemon's presence in the area.

However, you can catch Dragon-type Pokemon in this area, such as:

* Dratini: Found in the water surrounding the Dragon's Den.

* Dragonair: Found in the water surrounding the Dragon's Den, but much rarer than Dratini.

To catch these Pokemon, you'll need to use a fishing rod and the appropriate lure (Old Rod with Super Rod for Dratini and Dragonair).

Remember, the Dragon's Den is just a visual cue, not an actual location you can enter in the game.