For anyone new to Valenth, I'll briefly explain about 'rigging'. I had it explained to me by Twizz too, but because it doesn't seem to be listed anywhere (at least not in this thread), it might be useful to have this posted publicly.
Basically, each Valenth creature has 5 forms: the Alpha form (the one you start out with), the Beta form (the one your creature evolves into upon reaching lvl. 101), and one of three different Omega forms (the one your creature evolves into upon reaching lvl. 501). The three different Omega forms are lawful, neutral, and chaotic.
The thing is, the Omega form your creature evolves into is based on what food your creature has been fed. If it has been fed mostly 'lawful' food (all left food), it will become a lawful Omega. Mostly Neutral (center), a Neutral Omega, and mostly chaotic (right), a chaotic Omega.
A normal Valenth code looks like this (the 'Feed Me' text part between the <br>'s is already removed):
Code:
[url=http://www.valenth.com/feed/216461][img]http://valenth.com/lab/216461.png[/img][/url]
Now, you can rig this code so that anyone who feeds it will automatically feed it a certain food. Let's rig this one so that it is automatically fed a Sundrop each time (a lawful food, so it will evolve into a lawful Omega)
Code:
[url=http://www.valenth.com/feed/216461/Sundrop][img]http://valenth.com/lab/216461.png[/img][/url]
Notice where it says /Sundrop after the first series of numbers. This creature will now be fed a Sundrop each time someone feeds it (... through this link. If you have a link to this creature that is not rigged or rigged to another food, it will not be automatically fed a Sundrop).
If you want to rig a food that has spaces in it's name (Sparkling Water, Buttercreme Bar, ...) just put a + where the space is. Let's rig it to a Balance Elixir this time, a Neutral food, meaning it will eventually evolve into a Neutral Omega.
Code:
[url=http://www.valenth.com/feed/216461/Balance+Elixir][img]http://valenth.com/lab/216461.png[/img][/url]
This is also why many players take three or even four creatures of each kind. They rig one of each kind to a Lawful, Neutral, and Chaotic food, so that in the end, they will have a Lawful, Neutral, and Chaotic Omega of each kind. The (possible) fourth is because some players like to permanently have a Beta version of each kind as well. They do this by buying an item called an Alchemy Stone for 5000 Krüs (Valenth currency, received when you feed your own or others' creatures). This item halts any further development of your creature. It can still level up, but a creature in Beta form that reaches level 501 will not evolve into an Omega, but will remain a Beta.