Bugsy is in his gym in Azalea Town, which can be accessed after driving Team Rocket from the Slowpoke well. The only other place he would be is the Fighting Dojo in Saffron if you called for a rematch.
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take it to a Pokemon daycare after you beat bugsy and learn the move cut or get alot of rare candies or battle tons of trainers
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.
They are not in Pokemon HeartGold
No, but you can trade Pokemon only in HeartGold to Black