The Mixi Max Gun first appeared in Episode 2 and was used to fuse Fei Rune with Tyrano. In Episode 4, Wonderbot tried Mixi Maxing Yuuichi and Kyousuke and it was successful. In Episode 8, Wonderbot tried Mixi Maxing Tenma and Shuu and it was successful. In Episode 12, Wonderbot tried Mixi Maxing Shindou and Nobunaga's but it failed due to their power levels were different and Shindou had to train to Mixi Max. In Episode 14, Wonderbot tried Mixi Maxing Shindou and Nobunaga but it failed and got taken by Beta. In Episode 17, Wonderbot tried Mixi Maxing Shindou and Nobunaga and it was successful.