I would like an elixir to increase a pet from baby to adult with the purchase of a few crowns. I mean you already have the hatch all elixir, and hatch timer renewal elixir. Could we please have one more?
It takes about 5 minutes of training to get a pet to adult with mega snacks. Take up gardening and you'll have more than you can ever use. There's enough shortcuts available through crowns that this is completely unneeded.
Adding to what Seethe said, how upset will you be when you use your elixir and the pet is a fail? Now you've spent Crowns on something you could have done for no cost, only because you were in a hurry. If you are training the pet you can stop at any time a bad talent manifests... using an elixir is going to vault you ahead several levels and the possible bad traits will just keep stacking up.