This sounds really good.
I'll just throw my own intentions with Rocket into this, but I reckon we could make this work with a bit of planning.
Yes, Rocket is humiliated, more so than he ever has been in his life. Not only has he lost a battle miserably, but he had an audience as well. The taunts and jeers from the Swampert didn't help either. He feels weakened, alienated and embarrassed.
When everyone catches up to him and they're all drying off in the shelter, Rocket's shame is going to morph into anger. He's going to lose his temper and basically lash out at everyone, criticizing them to try and turn the attention away from his own failure. I reckon that Artemis, Hallow and Drago will get the worst of the abuse. An argument breaks out, until someone steps in to stop it before it gets out of hand. Whoever wants to do that can.
Once things have calmed down, however, Rocket will realise that what he did was a huge mistake. Running away from a battle is so out of his character it frightens him a little, and he starts to question his own motives and beliefs - did working that hard to evolve really make a difference, or is one's strength irrelevant in this day and age? Nonetheless, he'll eventually apologise, both for ditching them and shouting at them afterwards.
Now, while Rocket's apology may convince some members of the team that he isn't all bad, others might not be so pleased. This is where the rivalry between him and Hallow can begin. One or two characters may be permanently discouraged about Rocket after their first impressions of him, and that could lead them to lean more towards Hallow.
Rocket's likely to notice this pretty quickly but at first he won't say anything - he barely knows anyone in the group and so decides to say nothing for a while and see how it pans out. However, later on maybe he and Hallow can have a differing opinion on something, and the idea that half the group are now blindly following Hallow is going to anger him, and he'll lash out. It'd be interesting if this argument breaks out because of a moral that they disagree on.