I don't know why people are saying they liked this episode. It was horrible.
I mean, why the HELL would a Weather Station have information on Ancient Pokemon? WTF? Wait...is that the reason why they did it in the games? Still...WTF.
The plot could have been A LOT better. I love how in the anime Ash and Co always gets there BEFORE the Evil Team. Guh.
It would have been much better if Ash and Co met up with the scientists [as they did in the beginning] and Team Aqua had already taken over the Weather Station. Castform is too weak to fight them off, so they ask for Ash's help. Team Rocket find their way there and argue with Team Aqua. Team Rocket and the group work together to get to the main control room [or whatever it was] before Team Aqua successfully downloaded the information with Ash and Team Rocket battling the TA Trainers so that May, Max, Brock, and 'Millie' could get by unnoticed. This would also be a nice way for Team Rocket to battle and actually WIN [as they're not up against Ash].
When May, Max, Brock and Millie reach the control room, Team Aqua has just finished downloading the data. A battle ensues with May using her new Combusken, and Millie, Ditto. The Crawdaunts are too much for Millie and May to handle but in the nick of time, Ash and TR arrive and kick their asses.
When outside, Millie turns into Brody and the regular ending of this episode happens. I know it's not that much better, but I wanted to see some Team Aqua taking down-ness in this epi. Blech.
One word: Snoring.