Stacking of attack and defense point

Will gormeks defense down and wokong attack increase and combine together and increase the damage

Yes, of course.
Gormekk‘s def down is a Status ailment on opponents, wu makes an attack buff on your allies

For full reference I recommend this topic

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This.

But whilst we’re on this topic… Fire Wu Kong last!!!

If you fire Wu before your debuffers, you have a chance for the defence debuff to miss - you don’t want that, so you fire Wu afterwards!

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