Cinnabar Island is an island in Kanto. The Pokemon Mansion is here. Blaine is the Gym Leader here in Generation I and Generation III. The Pokemon Lab is 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.