Gen 1 = Psychic/Normal Gen 2 = Steel Gen 3 = Water Gen 4 = Dragon Gen 5 = Water
At least, to my knowledge.
In my opinion
Gen 1 is both because Normal make up the offense, Psychic make up the supporter
Gen 2 because it is dominant enough to make normals not as good as it used to be and there is no other crazy good type anyway....
Gen 3 because Suicune, but in general Ground is pretty huge as well
Gen 4.... Draco Meteor
I chose Water for gen 5 because the meta has never been as ******ed as the Broken Trio metagame. Even Volt Switch has a rather major water involvements. Fighting has never been a real dominant force until recenty(back then people was like Conkeldurr omg hit so hard, despite the fact that it carried less immediate power than even Machamp in term of common sets. Lol who's laughing now)
So, based on this, I say Water yet again in gen 6 if a massive nerf is not issued. Water is just that good.
Ice types (and Ice-types only) get a physical Ice Move with 100 Power and Accuracy... and changes the targets type into Ice.
That move would be awful. The biggest downside of being an Ice-type at the moment is having to switch into Stealth Rock without realistically being able to resist the opponent's attacks. Since type-changing effects disappear when a Pokemon switches out, a Pokemon hit with this attack won't suffer quite as much as a natural Ice-type.
Furthermore, by using this attack, you're ensuring that the opponent will be able to resist your primary STAB on subsequent turns, and very few Ice-types have access to decently-powered moves that hit Ice super-effectively (with Mamo, Cloyster, and arguably Weavile being the only ones I can think of at the moment). In the mean time, the opponent will be enjoying immunity to Hail and the Freeze status.
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It's been the literal punching bag for generations now. Ice has steadily gotten weaker, while everyone else got buffed, including the types it's weak to. Ice really needs something to give it it's own special edge against it's weaknesses.
Poison doesn't need a buff. It already has several niches and powerful moves.
I hope it is ice as well. I was really disappointed that we only got three new ice type Pokemon and every single one of them is pure.
With all the new type combinations you would think ice could have gotten one.
There are actually four to nine Ice-types introduced, depending on how you look at it: there's the three Kyurem, the Vanillish line, Cryogonal, and the Cubchoo line. If you consider the Kyurem as one, there are seven new ones. If you're counting evolutionary lines only, there are four. Total, though, there are nine.
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