| Pokedex Entries: |
| Red | An enigmatic Pokémon that can effortlessly regenerate any appendage its loses in battle. |
| Blue |
| Yellow | As long as the center section is unharmed, it can grow back fully even if it is chopped to bits. |
| Gold | At night, the center of its body slowly flickers with the same rhythm as a human heartbeat. |
| Silver | Even if its body is torn, it can regenerate as long as the glowing central core remains intact. |
| Crystal | When the stars twinkle at night, it floats up from the sea floor, and its body's center core flickers. |
| Ruby | STARYU's center section has an organ called the core that shines bright red. If you go to a beach toward the end of summer, the glowing cores of these POKéMON look like the stars in the sky. |
| Sapphire | STARYU apparently communicates with the stars in the night sky by flashing the red core at the center of its body. If parts of its body are torn, this POKéMON simply regenerates the missing pieces and limbs. |
| Emerald | It gathers with others in the night and makes its red core glow on and off with the twinkling stars. It can regenerate limbs if they are severed from its body. |
| FireRed | It appears in large numbers by seashores. At night, its central core flashes with a red light. |
| LeafGreen | An enigmatic Pokémon that can effortlessly regenerate any appendage its loses in battle. |
| Diamond | If its body is torn, it can grow back if the red core remains. The core flashes at midnight. |
| Pearl |
| Platinum | If its body is torn, it can grow back if the red core remains. The core flashes at midnight. |
| Stadium 1 | It is capable of growing back any portion of its body that is cut off. At night, the center core glows with a red light. |
| Stadium 2 | At night, the center of its body slowly flickers with the same rhythm as a human heartbeat. |
