1. They can't be made out out rare materials.
This means no blocks made out of Water Stones, Rare Candy, or other rare items, as this would allow players to grief structures to easily obtain these rare materials.
2. They have to have a purpose. For example, a rainbow pumpkin block would not really be beneficial.
3. The textures for the blocks need to fit Minecraft style, meaning they can't have something look too smoothed and will need to go along well with other vanilla Minecraft blocks.
Example: The block below can be used for ruins in an Unown dungeon or used for a Ground-themed Gym. It's not made out of something rare either, so people are less likely to grief for it. It can be used alongside several other blocks.
Anyway, hope to see some new block ideas for us to work on! :)
*NOTE: If you want to help us with these blocks, be sure to head to the main Pixelmon Discord chat here: https://discordapp.com/invite/drsNA?utm_source=Discord%20Widget&utm_medium=Connect
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