What happens in the Pokemon games when you catch all possible Pokemon?

[SilentWolf]

Naraku_Diabolos said:

It's just bragging rights. I have all 493 of them. Nothing special happens. I'm waiting for next version come out, which are probably remakes of G/S.

Red and Blue DO NOT use the Game Boy Printer. Only Yellow, Gold, Silver and Crystal use it. I have it in my bedroom, the printer that is.

No, I'm pretty sure that at least red can use the printer.  I vaguely remember wasting spending the money for one just so I could print the certificate.