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"Worst" is a bit hard to pin down because, like lots of other anons are saying, it is the team that got him the farthest. A lot of that is due to Ash having a super special Greninja that the writers used as a wild card-- it can KO a Mega Altaria with Water Shuriken no problem, but it gets fucked by Burrasto Burn because, well, that's what the writers wanted. Indeed, the anime pulls a bunch of bullshit when it comes to fights, and ignores a lot of basic mechanics.
Then there's this chart, which is outdated for Gen 6 Pokemon-- Goodra sure as shit isn't sitting at 100% any longer-- but still shows a lot of reliable information for the rest of his Pokemon.
On paper and in a purely competitive sense, Kalos is the weakest. There's a glaring weakness to Ice and Electric that would be super easy to exploit. If we look at his Pokemon through each region, and look at the best possible teams he could have in a somewhat objective sense. I'm going to ignore Pikachu because he's a constant that all teams share.
