Hi, welcome to Bulbapedia.
First off, let me point you in the direction of the manual of style and the Project Pokédex pages. As you'll no doubt notice, Pearl and Diamond are most definitely not side games. Those two definitely fall under the heading of version like the rest, and if a Pokémon is available in them, it should be noted in the appropriate section of the page.
Secondly, don't be an idiot on Psyduck's page. Not only did you spell it wrong, but even if you undid it, it's still vandalism, not funny, and I will be counting it as a strike against you. --TTEchidna 10:13, 24 May 2007 (UTC)