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Tyranitar certainly has been more godly than back in Advance. But not everyone bans Celebi...at least not the experienced trainers. And the only reason Celebi isn't on a lot of teams is because Celebi is rare and one with good Nature/IVs is even rarer.
If you ask me, most people on PC seem to ban all legends because they don't have enough competitive battling experience and think that legends are superior to normal Pokemon and therefore, must be banned.
When in reality, the only Pokemon that should be banned from standard play are the ubers on that list. The rest of the legends are far less threatening than many non-legends like Salamence, Tyranitar, and Rhyperior.
* The legendary birds all have Stealth Rock weaknesses (Articuno and Moltres have 4x Stealth Rock weak, which means they'll lose half of their health when they switch in).
* The legendary dogs/cats all have limited movepools, so they really don't have much to choose from in terms of attacking moves (especially poor poor Entei).
* The Regis aren't as great as they were in Advance. Their main job is defense, but the stronger new moves in D/P means they can't do their job as well anymore.
Also, Regigigas's Slow Start ability basically makes it suck.
*Speaking of defense, that's the main job of Uxie and Cresselia. They're great at taking hits, but they can't do much damage. Also, Dark types got much better in D/P, so even those two need to watch out.
*Mesprit has nice, balanced stats, but they aren't that impressive.
*Phione has crap stats. 'Nuff said.
*Heatran is pretty good, but it has low speed and a bunch of weaknesses
*Celebi is still good, but now it's afraid of the newer, better Dark and Bug moves in D/P.
Shaymin is just a lesser Celebi and can't even do that much.
*Jirachi is still good too, but it can't take down teams without a lot of setting up. It's offensive stats just aren't anything amazing.
The only legends that would actually pose a problem for many teams is Azelf and Manaphy, and this is mainly because they have access to a Special Swords Dance (Nasty Plot for Azelf and Tail Glow for Manaphy). This single move gives these two little legends a chance to beat even Blissey, the best special wall in the game.
Fortunately, Azelf has crappy defenses and a good Manaphy is very hard to find.
Basically, non-uber legends aren't really all they're cracked up to be. In fact, many of the old legends are even WORSE than they were in Advance. Unfortunately, D/P is full of people who have never been in a competitive battle before and it will take a while before they can realize all the things I pointed out above.
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