Our Adopt Me value list prices bare pets - no potions applied - and the pet pages note innate abilities where they exist, because they change the math: a Queen Bee flies out of the box but can't be ridden, a Cerberus rides but doesn't fly, and the 2019 dragons do both natively. Everything else earns its wings the paid way: Fly and Ride potions from the in-game shop, applied permanently to one pet each. Which raises the only pricing question that matters: what is a potioned copy actually worth?
The ceiling: replacement cost
Start with the argument that settles most disputes. Potions are renewable supply - anyone can buy another one from the shop whenever they want. So the premium for a fly-ride ("FR") copy over a bare one can never rationally exceed the Robux cost of just buying the two potions and applying them yourself. That's the ceiling. A seller asking for more than potion-replacement value on top of the bare price is charging you for work you could do cheaper - the polite response is to price the bare pet, add something under replacement cost for the convenience, and hold there.
In practice the market clears below that ceiling, for a reason worth internalizing: the buyer of a big pet is buying the pet. The potions are a sticker on the windshield.
Why the premium compresses as you climb
On a mid-list pet, FR status is a meaningful share of the package - the potions might represent a noticeable fraction of the whole trade, and two otherwise-equal offers genuinely separate on it. At the top of the list the same two potions are a rounding error against the pet's value, and traders treat them accordingly: Frost Dragon offers are negotiated on the dragon, with FR functioning more as a tiebreaker than a line item. The percentage premium shrinks as the base value grows, even though the potion cost is constant. If you remember one sentence from this piece: the premium is an absolute number, not a percentage - never let anyone apply it as a multiplier.
The mirror image: on cheap pets, potions can exceed the pet's own value - a potioned common is mostly potion. That's not a trade, it's a gift-wrapping decision, and value lists have nothing useful to say about it.
Innate abilities are not potions
The pets with built-in abilities occupy their own lane. Queen Bee's innate fly isn't "worth a Fly potion" - it's already priced into every Queen Bee that has ever traded, because every copy has it. What moves those pets' prices is the missing half: a ride-potioned Queen Bee or a fly-potioned Evil Unicorn completes the set, and completion is exactly one potion's worth of convenience plus a small liquidity kicker, because FR-complete copies of popular pets simply sell faster. Faster, not higher - demand shows up as speed before it shows up as price.
The verification habit
One safety note, because potioned pets are a small scam surface of their own: abilities are visible in the trade window - the fly and ride icons on the pet card - and "FR" in chat is a claim, not a fact. Check the icons on the actual pet being offered, every time, the same way you'd verify anything else in a trade. A mislabeled bare pet at an FR price is the cheapest scam in the game to run and the easiest one to catch.
The working rules
Pricing a potioned pet, in four lines: start from the bare list value. Add at most potion-replacement cost, discounted for the fact that the buyer didn't choose the potions. Compress that premium toward zero as the pet's tier rises. And treat innate abilities as already in the price - only their missing complement is worth anything. It's not a glamorous framework, but it prices every FR dispute you'll ever see, which is more than the sellers' version can say.