Not as good as the second episode, but still an amazing episode. I was so glad when Mars was finally showcased, with her being my favourite villain so far and my favourite Galactic Commander. The whole Croagunk sensing Toxicroak was a nice touch, soon as I saw it acting really strangely, I knew that it would be something to do with Saturn's Toxicroak and was pleased when the two began to battle, even if Croagunk basically got completely owned.
I loved near the very end of the episode when it added suspense to the ending by showing everyone's face seperately, it was just a great moment, made me want to watch part two straight away (which I did...)
Overall, 9/10, not as good as part two, but still amazing :]