Hardest/Annoying Mid/Mini Boss

This is mini-bosses, not final bosses
 
Bessie Bass from Yoshi's Island DS, she can just take forever to go and you only have to hit her three times and if you take too long your baby will get kidnapped and taken to Bowser's Castle and have to start again.
 
She is easy to beat, just swallow shy guys and watch bass jump up then throw egg
 
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