Ah, right yeah I added 3 new Pokémon two of what you said and one more which I won't reveal, what was your opinion btw?
Yeah they were very good, much more fun and more challenging than the last. :)
but for a really challenging AI you might wanna check out my elite four challenge; I experimented a little with movesets on various pokemon like:
calm mind + baton pass: suprisingly the AI will often use calm mind to get to stage 3-5 or so and then baton pass to a pokemon who will often sweep ur entire team coz his special attack will just be insanely high.
curse/rest/toxic/roar/whirlwind are also some good moves used by the AI pretty darn effectively.
but then if you use these beastly movesets and start giving your opponents ubers (like I have) people won't play coz they'll complain it's too hard. :P oh well; the more challenging the game the more fun it is imo. :)