Any tips for taking down tanks?

[C-WIGI]

I need to know how to take down tanks like Bowser, Dedede, and especially Donkey Kong because I'm in a local tournament but I'm having troubles beating this Donkey Kong main. Help please? I have like 2 months before we are doing another tournament. I tried searching up how to counter dk's cargo up throw but nothing appears except donkey kong guides so that's why I ask here

 

[MERPIS]

Grab, grab, grab some more. Your grab is especially good on DK due to his huge chunky T H I C C body, you also have much better frame data than DK and you can juggle him to death or gimp him rather easily.