||Trophy Garden/Swarms/Pal Park||

Learn about Trophy Garden, daily Swarms, and Pal Park transfers in Pokémon Diamond and Pearl after obtaining the National Pokedex.

Trophy Garden:

1. After obtaining the National Pokédex, the Trophy Garden expands.
2. Speak to the owner of the mansion in the right wing to get up to two Pokémon to appear.
3. You can manipulate which Pokémon appears by saving before you talk to the owner.
4. There is no time limit on the Pokémon; the earliest one will not change as long as you do not talk to the owner.

Swarms:

1. After obtaining the National Pokédex, Swarms will begin to occur on certain routes in Sinnoh.
2. You can find out which Pokémon are swarming by talking to Dawn's sister in Sandgem Town, or by watching TV (which may require sitting through other content).
3. Swarms change every day at 12:00 AM.
4. Saving and reloading will not change the Pokémon that appears in a Swarm; it is always fixed for the day.

Pal Park:

1. Also after obtaining the National Pokédex, the Pal Park opens on Route 226.
2. You can transfer Pokémon from your Game Boy Advance (GBA) games to Pokémon Diamond and Pearl every 24 hours.
3. You must wait a full 24 hours to transfer from a specific GBA version again. For example, if you transfer at 7:25 PM, you must wait until 7:25 PM to transfer from that version again.
4. Warning: If you alter the Nintendo DS system's clock, it will reset the 24-hour timer to the time you last changed the clock.