Suggested by Sonic Groudon is a very powerful Pokemon, definitely one of the stronger legendaries around. It’s safe to say that his fire attacks might be a bit hot even for this Shenron but ultimately the problem for him is that he won’t be able to keep up in terms of speed or durability. Nuova really just needs one very solid hit to connect and that should take Groudon out of the competition. Groudon isn’t fast enough to dodge the hit either so that’s why he would be taken down here. Nuova Shenron wins.