You need to trade a Porygon holding an Upgrade.
You get an Upgrade from Silph Co building.
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you can't. dubious disc is to evolve porygon 2 into porygon z, porygon z is a sinnoh Pokemon and leaf green only goes up to hoeen
You trade porygon from leaf green or fire red with the upgrade
Aerodactyl does not evolve.
you need to trade it and it will evolve
level 36.