Hyper Mega Evolution is different. ACHEM:
Hyper Mega Evolution's work similar to Mega Rayquaza/Zygaurde but with changes
Hyper Mega's gain 150 Stat points.
You can have 2 on a team.
They only last for 5 turns.
You can Re-Hyper Mega after {3} turns. You can't Hyper Mega 2 Hyper Megas on the same turn.(btw this is for double battles this doesn't affect single battles or your opponent)
They don't need items instead like Mega Rayquaza you need a Move
Hyper Megas CAN NOT SWITCH OUT AT ALL (They also can't be forced out by moves like roar, dragon tail, and whirlwind, moves like flip turn, volt switch, and u-turn)
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Changes to regular Megas:
Regular Mega's Work like a Evolution Evolution they evolve then the stone is returned to the users bag. However by holding the mega stone in battle They ALL get a boost to their highest stat upon entry (Dauntless Shield and Intrepid Sword are now +2)
They Last eternally till Un-Mega evolved by the trainer
Only {Three} regular Mega at a Time and Regular Megas CAN Switch out
Stuff in {} were changed by me to make it more fair looking back