The related link that has been added is a popular site about Pokemon.
Serebii.Net is the best Pokemon site you will find.
I only have one website I use all the time for information. That website is Bulbapedia. It has almost all the Pokemon sprites for the new gen and tells you when the games are about to come out.
A good guide to all things Pokemon would be Psypoke.com. It provides walkthroughs to individual Pokemon info to much more.
Pokemon serebii
All Pokemon aren't on Pokemon indigo because they either don't have good enough servers or they don't have enough people to upgrade the website fast enough.
go to the website the Official Pokemon website
yes but my website is not all about Pokemon will you still help?
The Pokemon website and Marriland.com
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A new website (created by me) is http://www.pokemontwo.jimdo.com/
This website shows all sinnoh Pokemon, all though diamond has some kanto, jhoto and hoenn region Pokemon thrown in for good measure however tese are not shown on this website http://Pokemon.marriland.com/diamond_pearl/pokedex
Playr.org