How to evolve Blastoise into mega evolution?
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It can Mega Evolve into Mega Blastoise using the Blastoisinite.
If held by a Blastoise, allows it to Mega Evolve into Mega Blastoise if it's Trainer has a Key Stone.
Reminders:
1. There is no Mega Evolution in Pokemon FireRed Gen III.
3. The Blastoisinite is a type of held item introduced in Generation VI.
For more questions for Pokemon FireRed check out the question page where you can search or ask your own question.