I think the first time I ever found the Serebii site was because I was looking into a rumor and it had an article on there debunking that myth that there was an incredibly small chance that you could find a wild Celebi in the grass on a certain route in Ruby and Sapphire. I then checked out the fakemons and it was all downhill from there LOL. Before I saw that article, I think I actually spent some time trying to find Celebi in the grass. You don't get myths and rumors like that anymore.
I think I saw all of the gen 4 mons on there for the first time too in a news post. It was literally like pictures of a DS screen with the Pokemon in the pokedex or something. Man, gen 4. Those were the first games I ever bought for myself without having to wait for Christmas or my birthday. That was right around when I started my first job and was able to buy both Diamond and Pearl on release from a now long dead K-Mart in town. Heh, never thought the good times would end.
I found the site around 2006 I think, when there were rumors Gligar was getting an evolution, but the image shown was actually Drapion I believe.
I had skipped Gen III after seeing a classmate playing Ruby. I remember thinking the new Pokémon looked awful lol and that Groudon and Kyogre looked like Digimon instead haha But my cousins and I were catching up at the time with FireRed and XD. None of us owned a DS though, so I had to wait till the end of 2007 to buy Pearl. I actually bought it on Thanksgiving, at a KMart too. But I didn't get the DS until Christmas. Then I got Emerald to get the missing Hoenn Pokémon.
K Mart and Target were always my choice to buy videogames. I hate the long lines at GameStop. I still have a DS case/bag with Giratina they gave me at KMart for buying MD Explorers of Sky the furst week it came out. It's gonna be 10 years and I still have it but now I use it for my 3DS. That particular store closed a few years ago though ☹ I found out when I went to buy Moon.