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Hyper Pink Lvl4 is obtainable from the Crown Jewel (also known as Casino) Robbery, in order to get a lvl4 one, you need to have a lvl3 hyperchrome in your inventory.
Pink LVL4 has mostly settled down and isn't showing much signs of improving anymore. It still performs relatively well, however its quite unlikely that it will rise in demand/value again, therefore the tag should now be removed.
Supply is widely distributed — no single holder owns enough to register as a hoarder.