Cinnabar Island is an island in Kanto. The Pokemon Mansion is located here. Blaine is the resident Gym Leader here in Generation I and Generation III. The Pokemon Lab is also located here. In Gen. II, a volcano erupted leaving only the Pokemon Center and forcing Blaine to move to the Seafoam Islands. The coast on the East side is famous for the Missingno Glitch.
None (though you can look inside the Pokemon Mansion)
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. In Generation I, if you talk to the old man who teaches you to catch pokemon, then fly straight to Cinnibar Island, swim on the south east side of the island (while being right next to the island), you can catch the glitch Pokemon MISSINGNO.