Awesome! I am a fan of old gen stuff, too! I ran dinkie penguin this year, was fun!
Which food you give daily determines the evolution path in these pets.
Also take care, they tend to get sick routinely, and you have to cure it and fill all of its bars again after ilness.
I gave the best care I could, but still got the bad ending, which soured me a little bit on dinkie penguin. Hopefully you can get the best ending.