The theory goes that Gary's Raticate sustained alot of injury on the S.S Anne after the battle with him, and due to the clutter and confusion aboard, the Raticate died.During the battle with him,he did not have his Raticate and he was at the Pokemon Tower.

It is beleivable as he did not have his  Raticate during battle, but i disagree as all Gary's pokemon were KO'd on the S.S Anne. If Raticate died wouldn't all his other Pokemon have died too.

The theory has a gaping hole in it but why was Gary at the Pokemon Tower. Maybe his comment was taken out of context. Or maybe, a Pokemon who was not seen in the story died and he was going there to pay his respects.

There’s a theory floating around the interwebs that paints a dark, horrific history of the Pokémon world, or at least Red/Blue’s Kanto region. Many players have noted that in Pokémon Red/Blue, there is a large absence of middle aged men in the game world. Think about the last time you played Pokémon. An abnormally large amount of Pokémon trainers chillin’ in the wild were little kids. Think about it. Why were there so many damn toddlers roaming the wilds unattended? There were plenty of elderly men and women in the world (Professor Oak), and many middle aged women (the player’s mom, the nurses), but a lack of middle aged men. What about the player’s father, or your rival’s father? While most people wouldn’t worry about the absence of middle aged dudes, some Pokémon fans have rationalized this through the creation of yet another insane theory.
 

The electric-type gym leader, Lt. Surge mentions being a survivor of some sort of brutal war that almost took his life (he claims that his Pokémon saved his life). Other trainers in the gym were once soldiers in some sort of army, which presumably fought in a war. A war where Pokémon were used as weapons. Let that sink in for a moment, as you try to imagine the horror of hundreds of terrified soldiers storming beaches being held by goddamn Charizards. Some fans believe this war was the cause of the lack of adult men, claiming that all of them had been killed in the war. Essentially, some people are speculating that this war caused a ‘generation kill’, and that the young children of the Kanto region are the first generation to find peace. This also explains why the player’s father is absent (hint, he died), and why the rival character has no parents (hint, they died). While a lot of this theory involves speculation and imagination, the horrifying idea of a human-Pokémon war that wiped out an entire generation is pretty damn sweet.
 

First off, There are alot of middle aged men in the game. Giovanni,Brock, Most of the Rocket Grunts,Lance, Bruno,Koga,and Lt.Surge are all Middle aged.

Pokemon Black and White introduces a new game environment, a bustling metropolis based on New York City. That's not just us saying that: "[D]irector Junichi Masuda revealed that Unova (Isshu) was modeled after New York City; the games' Castelia City takes the place of Lower Manhattan and the Sky Arrow Bridge serves as a stand in for the Brooklyn Bridge."

Neat, huh? Let's take a look at the map! So there's the Brooklyn Bridge, and there's Central Park, and there's Manhattan, and right below is ...
 

Oh.

Oh, dear.

So, how does Pokemon choose to depict the sensitive, emotionally charged setting of Ground Zero, a literal scar on our greatest city, left by our nation's most profound contemporary tragedy?

Obviously, they can't say the devastation was caused by terrorists. So they concocted a story about a falling meteor -- an object of unspeakable power that was quarantined by the government and is now being coveted by Team Plasma. Even weirder, another meteor dropped this Pokemon near the city.

Why do we bring him up? Take a look at his Wiki article. His official height is given as 9 feet 11 inches.
 

I dont think there are any mountains in New York City.Maybe i am wrong but there arent any mountains in this picture below:

above: see mountains

Also,Kyurems officiall height is actually 9 feet 10 inches.