Arcanine954, Nobunaga is definitely a hard boss fight - play it safe. Red nodes shoot Fire, Blue ones shoot Water, Yellow ones shoot Electric, and Green ones shoot Grass. White nodes will heal some HP and all status conditions of whoever stands next to it. You will probably want to have a main group of 4, plus the other 2 going around the side.
Also, you may want to bring a Ground-type with you, at least. My team at the time was Jolteon, Lairon, Excadrill, Darmanitan, Quagsire, and I forgot the last one. If you've got a Water Absorb/Volt Absorb/Flash Fire Pokemon, you can plant those by a certain color node and you can heal HP that way.
Moves that push, such as Iron Head and most of the Tail moves, can let you stack up damage quick. And whatever you do, watch out for Simisage and Zekrom. They can dish out damage fast. (I managed to stop Zekrom by using Excadrill and forcing it into a corner - it never attacked me.)