Cyber End Dragon vs Groudon
Cyber End Dragon is pretty powerful and his attacks can deal lethal damage in an instant. That being said, Groudon is a lot more maneuverable than the Cyber End Dragon and his attacks are just as deadly. If it came to a straight up beam battle then Cyber End Dragon may have the edge, but Groudon is quicker and that makes all the difference. Groudon wins.