Janet
Unpredictable as always, but Iris always lived for that thrill in life. First off, she returned Haxorus from her pokeball and she motioned Red to climb up with her as they would try to climb their way out of the situation, because from the looks of it they're pretty much surrounded. As she hung onto the the branch she offered him a hand. She wasn't sure if Red climbed a tree before, but assuming he goes on journey he would despite how clumsy he can be. "Grab my hand!" She called to him.
Nathan
*Oh crud! With the horde of Pokemon charging towards him at full speed, his eyes wander in desperation. Where to go? Looking up at the tree, he sees Iris offering a hand to him. Grabbing her hand, he hoisted himself up. Charizard as well climbed up the tree. The two clung onto the trees, hanging on dear life. While Iris, Red, and Charizard are up on the tree, the angry Pokemon below shook the tree.*
Janet
Although she was small herself, Iris clung onto Red's hand tightly and for more support she took both his hands. With all her might, she lifted Red up. Not bad! 
Charizard too decided to join up with them which did take a toll on weight of the branch.
She clung tightly to the branch and stayed close with Red. It doesn't help that the Scolipede was ramming itself and the other pokemon were shaking the tree vigorously. The branch was sort not taking their weight very well.
"What's the plan?" She asked hastily.
Nathan
*What is the plan? Well, climbing down the tree is out of the question. Charizard can carry both Iris and Red out to safety. That way, the two wouldn't have to face a crowd of Pokemon wanting to attack them all at once. With the tree branch close to snapping, Charizard scoops up the two kiddos, flying away from the outraged Pokemon. The draconic beast flew away until the group of Pokemon were no longer seen. Charizard descended down, scoping around the area. Yep! Those group of Pokemon are nowhere to be seen! Back to searching for Pokemon!*