:Sorry to burst your bubble, but that webpage looks a lot to me like the Japanese Super Smash Bros. Dojo Forum section. Even as rudimentary a translator as Google Language Tools revealed that the multiple posts on the webpage were made by people with different "nicknames". Each message also had a "contribution theme", which was the same for each post on the page (read: message subject). So, sorry, but your "evidence" is just fan speculation. But, at the same time, I hope you're right about Sonic! 

 :In case you want to see the rudimentarily-translated webpage, which comes out mostly as gibberish with no mention of Raichu or Sonic (to my knowledge), follow this link: