I checked the Other Dimensions being the Nether and the end and Obviously they were empty. [Except the enderdragon]. Why Not Giratina Spawn In the End. It Kinda Take a distortion world like of Look. Why Not spawn some Unknown Spawn in their as well. And the Nether could be a Great Place for some Impressive PixelMon to be spawned their as well. Could be a great Place to Fine Groudon, Larvesta's, Heatran.
Thats Pretty much all, just a suggestion for future updates to give players more reason to travel to other dimensions.