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More specifically, this newer "edition" prohibits modding, and likely mods like Pixelmon will never be compatible.
If you are still willing I heartily recommend both "vanilla" (unmodified) Minecraft and using mods like Pixelmon, as they have provided my children with a ridiculous creative sandbox that allows productive gameplay and is quite educational. Better still, get multiple copies and play alongside them in game.
As a side note, at this point I consider this fan made mod to be functionally better than the commercial game, in no small part due to the sense of ownership the children have over creations in the game world.