[Mairin really did make X think about his own friends, and their journey in Kalos. He thought back to Trevor and the knowledge and fear he held onto, to Shauna who had her dream used against her to be hurt. He knew it wasn't his own fault yet he still blamed himself, somewhere deep down. Yet despite all of that they had changed. They had grown stronger, together.

He waits, listening to Mairin's frustration before he spoke, quietly.]

You can become stronger, both you and Chespie. I can help you train.

[X still remembered his friends own determination to fight back too. He continued on.]

My team and I, we're strong. I took it upon myself to protect my friends because I didn't want to see them hurt. I was scared of them getting hurt because of me, but as a result I got overconfident. I couldn't think to ask them for help. I didn't realize they didn't need protecting. They wanted to fight too.

I can't say I can speak for your friend but maybe he's in a similar situation as me...so you should show him you can fight too.