How can you do 1000 damage on maple story

It depends on how you manage your ability points, and what your level is. You get 5 ability points and 3 skill points every level.

It also depends if you put your skills and abillity points on currectly i got a level 35 Thunder Breaker (kirissi Bera) and i hit 1.4k level 28 (with of course a pink floaty) i suggest a pink floaty from the agent w watermelon quest my pink floaty has 69 attack power and my regular knuckler only has 36 and it is scrolled