Kanto Black Legendary @pokemonsaves

 *Roaming Pokémon on routes 12, 13, 14, and 17 when it’s raining with thunderstorms.
• *Roaming Pokémon on routes 19 and 21 when it’s raining with thunderstorms.
• Portal in Unknown Dungeon 2F. Must have Tornados and Thundurus in your party.
• Portal in Unknown Dungeon 2F. Must have Virizion, Cobalion, and Terrakion in your party.
• Portal in Unknown Dungeon 2F. Must have Reshiram and Zekrom in your party.
• Many in Navel Rock. See Prof. Oak aid in Rush Tower when you have 60 Pokemon registered as caught.
• One in Birth Island (you get the ticket by winning a mini-game in Two Island)
• Mt. Ember
• Lost Cave
• Altering Cave (yes, the puzzle is solvable without referencing braille.)
• Tanoby Chambers
*Do not search for them in the wild grass. Their overworld sprites generate when it rains in the routes specified. They will appear after you have obtained the 6th badge.