Blaze
Blaze had been trying to break out of his pokeball ever since Xavier had began to panic. You see Blazes pokeball was a luxury ball, it allowed him to hear what was going on outside, eventually he was about to give up when he heard the other Growlithes comment, it wasn't exactly a good time then and there, but Blaze wasn't going to forget that, how one of his own kind could have so little honour, he didn't know. He would get the other growlithe, Nova, back for that.
I found it. He made Blaze mad by calling Xavier a weirdo. :D