Although Grundos are restricted, they are easily created by going to the Space Adoption Agency. Make sure you have a spare spot for the Grundo, and follow the instructions there.
Draik Eggs do restock at Merifoods. It is extremely rare!!
Krawk can be made through the Krawk petpet (around 12,000,000NP) found at the Tyrannian Petpet Shop, or through a Morphing or Transmogrification Potion. You can also have your pet play with a Magical Plushie.