Play with Faerie Queen Doll
Visit the lookup of your snow pet that is 100+ days old.
Have a Krawk as your active pet and go to the Fungus Caves.
+
Feed your Jetsam an Aquatic petpet/Fight in the Battledome with or against a Jetsam.
Have a Gruslen equipped to your pet for 99+ days. Then visit its lookup.
Have a Huggy attached to your pet for 99+ days.
+
Have a Slorg equipped to your pet for 100 days and visit its lookup.
Feed your Pink pet anything with the word 'popcorn' in it.
-
all the petpets are for -4 months
Jetsam, Krawk and Snow not.