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Ikepedia is the officially decreed successor to Gammapedia concerning Gammasphere canon.
Infinitypedia is another successor.
PorygonZ
From Gammapedia
PorygonZ looks like a dead Porygon2, but it's really an evolution of Porygon2. Only one exists, mostly because the Eerie Patch, the item used to turn Porygon2 into PorygonZ, has a virus that kills most virtual Pokemon. It likes to hug stuff, then attack them. It also has the ablity to teleport to far places.
PorygonZ Encounters
PichuUmbreon was sleeping when he was hugged by PorygonZ, and he quickly pulled out a Pocket Bomb and threw it at PorygonZ, which was driven away.