To get Mime Jr., you must trade it from Pokemon Diamond.

Go to Spear Pillar to catch Parukia.

Trade Regirock, Regice, and Registeel from Pokemon Ruby, Sapphire, or
Emerald and keep them in your team. Then, go to Kissaki Temple to catch Regigigas.

Go to the Hakutai House at night, then go to the television and a wild Rotomu will appear.

Go to Flower Elysim to catch Shemei.

Have the Game Boy Advance game Pokemon Ruby in the cartridge slot and search for
Solrock.

Have the Game Boy Advance game Pokemon Fire Red in the cartridge slot and search
for Weedle.

Go to Wisdom Lake to catch Yukishii.

At the Jubilife television station, talk to anyone you see. If you find the person, enter
"EVERYBODY HAPPY"; enter "WI-FI CONNECTION" for the WiFi people. You can get Pokemon such
as Arceus, Shaymin, and Darakai. Note: You must have a WiFi or DS wireless link
cable.

This trick requires a Pokemon that knows "Thief" and a Ditto. Enter a double battle with a
Ditto without an item and a Pokemon holding the item you want to duplicate. Make Ditto
transform into the Pokemon holding the item. Switch the Pokemon holding the item with the
Pokemon that knows Thief. Use Thief on Ditto, then win the Pokemon battle. The Thief
Pokemon will now have a duplicate of the item.

Note: This trick requires two Nintendo DS systems. While underground, get some
Traps or Spheres, then go to the surface and save the game. Go back down, and set your
Trap or Sphere anywhere, then set the other person to COM and take the Trap or Sphere.
Turn your game off, but leave the other person's game on and save it. Both people should
now have the same Trap or Sphere.

Because the in-game clock is in sync with your Nintendo DS and since certain events only
happen every once in a while, you can simply adjust your DS clock. For example, the guard
in the Pokemon Mansion is guarding the Bronze Statue around the clock, but he takes a
break between 2 and 5 a.m. Just adjust your clock to that time and he will be gone. You
can also do this to speed up berry production by jumping a few days back and forth.