So your saying make a new adopt for Ivysaur and place it's evolution info like you did Bulbasaur?

Well I will show you an example of how to do multiple stage evolution for adoptables. It is quite easy though, but maybe a tutorial is gonna help. I may also post solutions for other possible evolution approaches in premium members forum, such as item and trade based evolution.

If we need to do so, doesn't that mean we need to add more rows to the levels table as well...?

I asked HOF over user messages and he told me this:

So if I got this right you just make a new adopt (Ivysaur) and enter it's evolution, (Venusaur, and lvl at 36) the same way way you did as Bulbasaur. Then again create new adoptable (Venusaur) and it automatically changes the name?

Did I get that right Hall of Famer?

Yes, this is the way it is supposed to work. Also make sure you do not make a mistake when entering information for Venusaur, or the image will not show.

So....uh just to be clear, we really DO need to add new levels to the _levels table?
(for Ivysaur and Venusaur)

OK I tested this:

I made a Bulbasaur, made it's evolution Ivysaur at lvl 1 (for a test).

Made a new adopt Ivysaur

Added one lvl

Adopted Bulbasaur

Clicked it and got a X for the image but it's name did change to Ivysaur just not the picture.

I did this about 3 times with the same conclusion.

umm thats not supposed to be the conclusion at all! There must be some wrong settings for the image url of Ivysaur and Venusaur on your site. Can you show me a screenshot of your Ivysaur and Venusaur in prefix_adoptables, and prefix_owned_adoptables table? I'd like to see what went wrong. A possible reason is that you did not create levels for Ivysaur and Venusaur, which did cause a similar problem on my site before.

This was the problem I didn't know that Ivysaur neede to have the same ammounts of lvls in this case Ivysaur need a lvl 16.

Make a Ivysaur give it 16 levels so when bulbasaur hits 16 you get a lvl 16 Ivysaur?

Question does the evolution pick up gender and alt picture as well? I noticed it retains it's name I was wondering if the other do to.

Yeah, you will need to create levels for Ivysaur and Venusaur too in order for the script to work properly. Since the only things that change are your pet's species name and evolution info upon evolving, its gender, altimages and any other attributes should retain.