I play pixelmon to level pokemon because it's fun, it's so irritating that you need a structure or you have to find diamonds, a bunch of iron and that bauxite stuff to be able to level them without them dying.
From what I understand, pixelmon structures randomly generate, so if you re-create a world new structures should appear.
As for finding the diamonds and whatnot, when you sleep at night the pixelmon in your party are fully healed,so while it may take more time, it's more resource-friendly.
Used this seed for my game for 1.8.9 version, and it spawns you next to a village that has a Pokemon center, a shop, and a healer's hut (the red domed houses, that's that I call them). About 100 meters away is another village with another shop and healer hut. Within 500-700 meters of spawn is an ocean, a desert biome, savannah, and jungle.
vanilla seeds work with mods such as this one. If you're on 1.10, try:
Then walk forward, towards the clearing and you'll see a pokecenter and pokemart in a couple of blocks. If you're on a later version, I'd suggest looking up seeds corresponding with the version of Minecraft you're on.