Ah, Malachite... you seem to be the most evasive of the pet rocks. I know I'm not the only one to have trouble getting a hold of one!
I tried buying a box of rocks recently, but... still no Malachite. If anyone has somehow acquired a spare they're willing to part with, though, the two "rare" types I did find are a Lumpy Sandstone and a Freckled Pet Rock.
I have a number of other items I'd be willing to trade for one if preferred, too. Roses (white, yellow), a Summer Lily, regular Mushrooms, and some of each type of throwable (glitterbomb, fireworks, snowball, waterballoon, and cherry blossoms). I also have cloaks of most colors (regular if you just want the character slot, but also red, green, purple, and white).
And while all of those items are either always available somehow or likely to eventually become available again, I've also been holding onto a few fundraiser-specific items that will never be available again. I have 2 boba teas (Red Bean and Butterfly Pea) that can also heal you 1-4 HP if you don't mind losing the collectable; a single-use Spoon that can be used to change a cappuccino into a random different type; and even some 2-use Bacon that grants an additional character slot per use.
If you can assure a good home, I may be willing to instead part with one of my named pets that I have a type duplicate of. I have all my pets' wellness at 100% (correction, most of my rocks are in the 90s at the moment), but I think that resets to 50% when they get a new owner. They keep their name and pronouns unless you change them. I'm not sure if they keep the same traits and favorite food, but I'll list those details with the pets I'm willing to consider trading in case they do and there's traits you're looking for.
I tried buying a box of rocks recently, but... still no Malachite. If anyone has somehow acquired a spare they're willing to part with, though, the two "rare" types I did find are a Lumpy Sandstone and a Freckled Pet Rock.
I have a number of other items I'd be willing to trade for one if preferred, too. Roses (white, yellow), a Summer Lily, regular Mushrooms, and some of each type of throwable (glitterbomb, fireworks, snowball, waterballoon, and cherry blossoms). I also have cloaks of most colors (regular if you just want the character slot, but also red, green, purple, and white).
And while all of those items are either always available somehow or likely to eventually become available again, I've also been holding onto a few fundraiser-specific items that will never be available again. I have 2 boba teas (Red Bean and Butterfly Pea) that can also heal you 1-4 HP if you don't mind losing the collectable; a single-use Spoon that can be used to change a cappuccino into a random different type; and even some 2-use Bacon that grants an additional character slot per use.
If you can assure a good home, I may be willing to instead part with one of my named pets that I have a type duplicate of. I have all my pets' wellness at 100% (correction, most of my rocks are in the 90s at the moment), but I think that resets to 50% when they get a new owner. They keep their name and pronouns unless you change them. I'm not sure if they keep the same traits and favorite food, but I'll list those details with the pets I'm willing to consider trading in case they do and there's traits you're looking for.
Named Pets
Derbo the Flat Pet Rock - he/him
Proud | Average appetite | Average entertainment needs
Favorite food: ice cream
Paperweight the Flat Pet Rock - they/them
Proud | Big appetite | Easily entertained
Favorite food: ice cream
Peach the Lumpy Pet Rock - they/them
Excitable | Big appetite | Easily entertained
Favorite food: fruit
Puffle the Lumpy Pet Rock - she/her
Excitable | Low appetite | Needs lots of entertainment
Favorite food: fish
Plomp the Lumpy Pet Rock - they/them
Sleepy | Average appetite | Average entertainment needs
Favorite food: pizza
Pear the Mossy Pet Rock - they/them
Timid | Low appetite | Easily entertained
Favorite food: taco
Boomy the Mossy Pet Rock - they/them
Proud | Low appetite | Needs lots of entertainment
Favorite food: fish
Fear the Pet Amethyst Geode - she/her
Studious | Average appetite | Average entertainment needs
Favorite food: fish
TheAbyss the Pet Amethyst Geode - he/him
Goofy | Big appetite | Needs lots of entertainment
Favorite food: fruit
Raina the Purple Phoenix - she/her
Excitable | Average appetite | Average entertainment needs
Favorite food: fish
During Epic Week, phoenixes have a slight chance of assisting in combat.
Proud | Average appetite | Average entertainment needs
Favorite food: ice cream
Proud | Big appetite | Easily entertained
Favorite food: ice cream
Excitable | Big appetite | Easily entertained
Favorite food: fruit
Excitable | Low appetite | Needs lots of entertainment
Favorite food: fish
Sleepy | Average appetite | Average entertainment needs
Favorite food: pizza
Timid | Low appetite | Easily entertained
Favorite food: taco
Proud | Low appetite | Needs lots of entertainment
Favorite food: fish
Studious | Average appetite | Average entertainment needs
Favorite food: fish
Goofy | Big appetite | Needs lots of entertainment
Favorite food: fruit
Excitable | Average appetite | Average entertainment needs
Favorite food: fish
During Epic Week, phoenixes have a slight chance of assisting in combat.