I believe there are 19
Defeat All 10 Bosses Its Simple Really the easiest way is to be hammer Kirby or rock Kirby
Kirby Super Star featured a boss that would be battled in a RPG fashion reminiscent of Final Fantasy. Three bosses are fought together and are known as Computer Virus. While fighting them the hit points are displayed in a window in the background much like Final Fantasy.
Pretty much all of the bosses. (correct me if I am wrong) Bowser could be FIGHTING the final boss, too. (ex. Mario and Luigi, Bowser's Inside Story, etc.)
I assume you mean control with the Ghost ability. You cannot control Bosses or Mini-bosses with Ghost. Only regular enemies.
Yes it's a lot harder with less HP and stronger bosses
The levels are a lot harder because Kirby only has half health and the bosses are a lot more difficult to beat.
you have to beat at least 13 bosses in The Arena
your mom and you
The Ozma and Tantarian.
Hero = 8 bosses, Dark = 8 bosses, Last = 2 bosses so 18 bosses in total.
The best Pikmin for beating bosses including the Burrowing Snargret and the final boss is a team of 100 Rock Pikmin.
I don't know any action replay codes, but you can turn into Super Sonic (and Burning Blaze) in Sonic and Blaze mode. You unlock it after beating the final-final bosses. You unlock the final-final bosses after you get all the emeralds.