Goomy’s slime isn’t acidic enough to melt anything yet, so it can only eat soft foods. Anything harder than a berry will just sit in Goomy’s stomach for two days until Goomy finally spits it back up.

Whatever Sliggoo absorbs becomes a part of its acid’s chemical structure. This can change its color and its danger level. Nearly everything makes Sliggoo more poisonous, except pure water seems to make it completely harmless.

Goodra’s meek disposition makes it a poor hunter, so it seeks out human food more than any other Dragon-Type. If you wake up in the night to find that your camp has been covered in disgusting slime, you’ve probably been visited by Goodra.

Observe the way this form of Sliggoo opens its mouth; it’s somewhat disquieting.

maybe the inside of the shell gains iridescence from the slime’s impurities?