Any way to rack up the highest amount of damage as possible. Can we achieve 999%?

1.) For my first attempt, I surrounded Sandbag (this is almost poetic) with gooey bombs. I positioned it so that the gooey bombs would spawn directly above Sandbag on both sides, so the bombs actually clipped into sandbag. Then, I jumped in and threw a firework at Sandbag before I touched the ground (to avoid mispositioning the bombs). The explosion was so huge Sandbag's health icon disappeared. I tried this again a couple of times and Sandbag attained on average ~450%.

2.) It was at this point that I noticed the fireworks actually do a lot of damage, so I said why not? and surrounded Sandbag with fireworks similar to my first attempt. Then I jumped in and threw a firework straight downwards at Sandbag. I thought the first attempt was loud ... The screen was like a strobe party... Me and Sandbag got comboed into the air by firework > firework > firework > firework until Sandbag got star ko'd at 798%. And this was while there were still several firework explosions on screen. Sandbag could have potentially gone to 999%.

And while we're here, we might as well add the highest amount of damage you can preform without the item tab in Training Mode.

Get into a good position and spam Sword Rain, holding the "Up" key all the while. If done right, the opponent will be trapped forever until the end of time
Have fun

Maybe the highest damage hit from melee? Ness PK Flash x3 -> G&W Bucket -> Marth counter.
Edit: If it doesn't need to be a combo, fox lasers.

Fox multishine against a wall. Easy money, and pretty fast, too.

Or Fox dthrow>shine>repeat.