Lukas spent about an hour showing Oak his Forecast Frequency. They also talked for a while about how Lukas had been doing after his injury and how Oak and the others had been doing without Lukas.
From it Oak told him, the group had been doing fine without him. His absence was felt, but they weren't helpless without him. He even told Lukas that Axel had been fighting in his stead. Though, judging by Axel's mood, maybe that wasn't a good thing.
Oak said they hadn't run into any major threats. A few two-hearted ghasts here and there, but no three or four-hearted ones. Everything Oak said, though, only made Lukas want to join in the fight more than he already wanted to.
He felt bad sitting around doing nothing. Although, he wasn't spending his time doing nothing. He was recovering, his body needed the rest after all. Furthermore, during this recovery, he had been experimenting with, and learning more about, his new Forecast Frequency.