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+100 BST with unique distributions.
You can even do something like Mega Beedrill which subtracts -30 from its Special Attack to go towards Attack and Speed.
Updated Abilities.
Updated Types.
Updated designs are EXTREME, but without overwriting the original. Basically a super form.
Good for hype and speculation. Everyone wanted to know "Who is getting a Mega next?!" No one asks this about Dynamax or Z-Moves because everyone can already use them.