Sadly, the only currently known way to get this unique event pet is purely through microtransactions. Yeah, you read that right, you will need to spend money to get it.
If you’re still interested, you will need to head to the Roblox shop and find the Cyber Bunny Helmet.
This is a time-limited head piece that will be available until April 13, 2023. It costs 40 Robux, which is about 0.50 USD. However, you will need to buy at least 80 Robux for 0.99.
Once you’ve bought the Cyber Bunny Helmet, open the Avatar Editor and equip it. Now rejoin Pet Simulator X.
As soon as you’re back in the game, you will get a pop-up thanking you for your purchase. This will also mention that you have received a special pet as a thank you.
Open your pet inventory and look for the Purple Marshmellow Chick. You should now have it ready to go!
It’s an event pet with the unique Companion I trait, which makes it 50% as strong as your best pets. It also has the Agility II trait, which makes it move 35% faster than normal.
That’s everything there is to know about obtaining this unique pet! Hopefully there will be non-paid ways to get it later on, but nothing has been announced yet.